I'm new to VBA in Access. I have set up a query that uses some VBA to requery on a combo box selection. This works great however every so often Access will randomly crash.
Is there any "if error" statement I can put in my VBA code that will pop up a message rather than completely crashing?
Error handling in your application is a separate issue from Access crashing. Even if you reach the low limits of Access (https://support.office.com/en-us/article/Access-2010-specifications-1E521481-7F9A-46F7-8ED9-EA9DFF1FA854), it shouldn't be crashing, but giving you an error message. That's a bug not of your doing. I've used Access for a while, and sometimes you have to work around the bugs, as well as the limits.
Sometimes, the VBA compiler fails to get things right after you make a change. If you Cut and Paste the text of an entire Module, it seems to force the compiler to recompile that whole Module. Always use the Debug > Compile menu item to compile and check your code. Then save.
Sometimes, doing the Compact and Repair will resolve problems. In fact, you need to Compact and Repair, because it seems that the file will bloat non-stop otherwise, and it has a 2GB limit. Do a backup first, because the Compact and Repair sometimes fails, leaving you with garbage.
Magisch gave an example of error handling in VB, which is something you should do to write a robust application (see http://www.vb6.us/tutorials/error-handling).
First of all, your an ordinary error shouldn't cause access to crash. If it does, you probably need to clean up your file some, for instance by repairing or de/re compiling it.
Secondly, if you want to handle errors in a simple way you can do it roughly like this:
Public Function doStuff (myInput as Integer) as Integer
On Error GoTo Error_Handling
'something that may cause an error to occur
Exit Function 'Important so your error handling doesn't get executed every time the function runs regardless
Error_Handling:
'something that you want to happen when the error occurs
End Function
My Labview Program works like a charm, until I look at the Block Diagram. No changes are made. I do not Save. Just Ctrl+E and then Ctrl+R.
Now it does not work properly. Only a Restart of Labview fixes the problem.
My Program controls two Scanner arrays for Laser Cutting simultaneously. To force parallel working, I use the Error handler and loops that wait for a signal from the Scanner. But suddenly some loops run more often than they should.
What does majorly happen in Labview when I open the Block diagram that messes with my code?
Edit:
Its hard to tell what is happening without violating my non-disclosure agreement.
I'm controlling two independent mirror-Arrays for Laser Cutting. While one is running one Cutting-Job, the other is supposed to run the other Jobs. Just very fast. When the first is finished they meet at the same position and run the same geometry at the same slow speed. The jobs are provided as *.XML and stored as .net Objects. The device only runs the most recent job and overwrites it when getting a new one.
I can check if a job is still running. While this is true I run a while loop for the other jobs. Now this loop runs a few times too often and even ignores WAIT-blocks to a degree. Also it skips the part where it reads the XML job file, changes the speed part back to fast again and saves it. It only runs one time fast.
#Joe: No it does not. It only runs once well. afterwards it does not.
Youtube links
The way it is supposed to move
The wrong way
There is exactly one thing I can think of that changes solely by opening the block diagram.
When the block diagram opens, any commented-out or unreachable-code-compiler-eliminated sections of code will load their subVIs. If one of those commented out sections of code were somehow interfere with your running code, you might have an issue.
There are only two ways I know of for that to interfere... both of them are fairly improbable.
a) You have some sort of "check for all VIs in memory" or "check for all types in memory" that you're using as a plug-in system. When the commented-out sections load, that would change the VIs in memory. Such systems are not uncommon when parsing XML, so maybe.
b) You are using Run VI method for some dynamically invoked VI to execute as a top-level VI, but by loading the diagram, it discovers that it is a subVI of your current program. A VI cannot simultaneously be top-level and a subVI, so the call to Run VI returns an error.
That's it. I can't think of anything else. Both ideas seem unlikely, but given your claim and a lack of a block diagram, I figured I'd post it as a hypothesis.
In the improbable case someone has a similar problem. The problem was a xml file that was read during run time. Sometimes multiple instances tried to access it and this produced the error.
Quick point to check: are Debug and "retain data in wires" disabled? While it may not change the computations, but it may certainly change the timing of very tight loops, and that was one of the unexpected program behaviors, OP was referring to.
This has been a long and unresolved problem with Excel VBA code that runs a repeated loop via the Application.OnTime Now + TimeSerial(x,x,x). Users will find that their code is running fine for a few days and may, or may not, mysteriously stop.
I'm facing such a situation and hoping to resolve it. I've read over 30 forum answers, some written by experienced developers, and came to this understanding. My conclusion and question follow.
The conclusion is that Excel randomly goes into a break mode but no one knows the reason why this occurs, more so, why it randomly occurs.
Shall we then conclude that in fact this randomly occurs? And that Excel VBA isn't as robust as other languages.
Some notes:
I know this can be resolved by pressing Ctrl+Break twice. It doesn't explain why we have to do it in the first place.
I realize that this error is code independent. It'll occur with both simple and involved programs.
After trying multiple ways to simulate this error, and I mean a lot - long and multiple ADODB SQL connections and queries, cell editing while macro is running, using multiple and 1 second Application.OnTime recursive calling, I can't replicate the error. It is truly random.
I'm running only one workbook and one Excel instance.
Some say, for each break point we did in the debugging, that break point remains in memory. And then when we run a macro in the future, a write to that part of memory triggers this random break. This is a plausible explanation and does conclude that this error is random. No way can we inspect memory in VBA.
I need something to go by, even if it isn't to solve this problem, to act as proof for my boss.
I've solved the bug! I've not read this answer to this problem before so it is pivotal that the Excel community receives this.
Excel fails to call its sub routines in the Application OnTime queue whenever this happens. You have started to edit a cell, stayed in edit mode, and then switched away from Excel either by minimizing the window or by clicking onto another window.
All the sub routines in the Application OnTime queue will wait until the cell is finished editing. So once you switch back to Excel, the cell switches edit mode off, and then all the sub routines will run.
I'm actually quite impressed I solved this myself.
I've run into this issue with many different VBA programs, so I'm thinking I may have some incorrect settings in Excel or the VBA editor. Honestly, I'm pretty clueless after a lot of web searching.
Basically, I'll be running a normal piece of code and the application (both Excel and the VBA Editor) will go into (Not Responding) mode. However the code is running fine. Once the code is finished, the application will no longer be in non-responsive mode and everything returns to normal
Really kinda frustrating on users who think something is wrong when really it's just taking a while to run the code.
Any help would be great! Thanks!
Try putting DoEvents statements in your code, so that DoEvents is executed every so often during a lengthy process. See http://support.microsoft.com/kb/118468/en-us
This will return control to the OS, so that the OS can do what it needs to do while your program is running, and this should prevent the OS from thinking that your program is not responding.
Basically, I'll be running a normal piece of code and the application (both Excel and the VBA Editor) will go into (Not Responding) mode. However the code is running fine. Once the code is finished, the application will no longer be in non-responsive mode and everything returns to normal
The User Interface is not responding because you are doing a bunch of processing in response to a UI event.
If this is acceptable to you and your users, all's well enough. If not, consider doing the work on a background thread.
I'm working on a big Access 2003 project with Microsoft Access 2007. Recently, some users have started to experience problems with the buttons in my forms. For example, without any specific reason, clicking on a button or trying to execute any code will return the error:
File not found
There is no way to go into debug mode. When this happens the only thing to do is to restart the database. I tried adding the Stop command at the beginning of the executed block to try debugging it, but no code is executed at all. It's like a compilation error but it's only happening 5-10% of the time, which is really weird.
After some research, I found other people are having the same problem, for example this and this link. There are other examples too, with no real solutions yet.
My database can be okay for a week and then the problem starts to happen again. Half the time and users can't do much; they need to restart the database once or twice to get it back working, and after a few minutes the error might happen again.
Because this is Access 2007 and there are a lot of people experiencing this bug, I can't believe it isn't more documented.
What's the problem? Is the database somehow partially corrupted? What should I do? This is really annoying.
If I was in this situation one of the first things I would try would be to do a complete decompile+compact+recompile operation on the front-end database file, and then distribute that updated front-end out to the users to see if that improves things.
Detailed instructions on the decompile+compact+recompile steps are available here. Note: Be sure to read David W. Fenton's additional recommendations in his answer.
I had just experienced this for the first time. I had been making extensive coding changes in a form, and was required to reboot my PC without finishing debugging the code. When I opened the app, I immediately got the "file not found" message (it auto-starts a different form).
On a whim, I went to the form in question and commented out that entire module's code and the problem went away. After I went back in and uncommented that code, everything still worked as normal. I was able to continue debugging that code and lived for the rest of the day happily.
though this thread is over a year old I would like to share another very helpful observation.
This error "File not found:" may be caused by differing save behavior of Office versions and may not have anything to do with your code! In case of this error, try to open and save your troubled file in another Office version and it may work fine back in your main Office version.
Details:
Though programming VBA for years now, I had never had an unsolicited "File not found:" error. Weird also that the error message does not give a file name for the file not found. (Reminded me of another nasty error VBA sometimes shows on startup for no obious reason and erratically.) Luckily this error started after my first edits in PowerPoint 2010 after having tested the file in PowerPoint 2016. The error occurred when opening the .pptm but I had no startup procedure involving a file. So I've got the idea of some file in the .pptm zip archive not being found. Started to do a quick search on the internet and found only "shooting in the dark" suggestions. As I could start PowerPoint 2013 more easily (virtual machine) than PowerPoint 2016 (different Windows 10 boot partition), I tried to open the troubled file in PowerPoint 2013 and had no problems. I compiled the VBA project to check for error. Nothing. And save the file. After this re-saving in PowerPoint 2013, the file seems to work fine again in PowerPoint 2010 und did not show any problems after the first few edits, saves and re-opening. This being said, I wonder if PowerPoint 2016 saving is peculiar and if I can replicate/if I will run into the error again if saving the file again in PowerPoint 2016 and returning to PowerPoint 2010. (I'll make a note of this thread to add new insights once I worked with this file again in PowerPoint 2016.)
Hope this observation may spare many unnecessary un-/re-installations of Office and other desperate attempts.
Cheers!
A similar thing has just happened to me a couple of times with one of my .mdb front ends running in Access 2013, after the August 2019 update to Windows 10.
My DBs too have been through several versions of Access. On opening the database it says 'File Not Found' and throws up a public module (not one on which I have been working extensively recently), without opening the Autoexec (Switchboard) form. 'Debug, Compile' is possible and doesn't suggest any problem.
For me too, typing one space (or blank line or other character) anywhere in the code, and then deleting it, and saving, closing and re-opening seemed to provide a workaround, and all has been well for the last few days (I am the only user at present).
There is no one obvious module involved, although I will probably suspect the form module I have been working on most recently if the problem persists in a troublesome way.
Now, a few days later I have de-compiled, compacted and re-compiled the database, halving its size, so maybe that will have done the trick. I hope so.
I just had this problem. In my case, I think the issue is having a blank VBA module. I was moving procedures from one module to another and ended-up with a blank module. I couldn't delete the module manually and every time I tried to create a procedure to delete blank modules, I received the "File not found" error and the procedure I had just created was blanked out. I ended-up reverting to a backup.
The issue is just your references. One of the files for your references has been moved/deleted/updated. Remove and re-add your references to figure out which one.
I had a problem similar to this. A blank "File Not Found" error.
I turned off AutoCorrect and after clicking through several prompts/warnings which had me concerned, I then reopened the database and the error went away.
When reopening the database the problem was resolved.
I suspect this will fix many "File not found" errors which are probably related to the temporary link table losing a reference for whatever reason.
I had this same issue MS Excel.
On the user pressing a button a useless File Not Found error appeared.
I ran through all suggested above and no change or help.
COMPLETELY ACCIDENTALLY I removed a module that i use for updating the Application status. This also has some array storage within. However, on removing this module (and commenting out references to it within my code) it appears that the issue is now fixed across users.
One Issue, is I have the same Module name within several different deployment's of Excel Add-ins. I suspect that on first run Excel isn't able to automatically assume the difference between them.
I had noticed a WORK AROUND for the error in which you create a break point on the first line of code for the button in question and then resume on break - I assume that this helped Excel evaluate and namespace the modules as to not cause conflicts.
I had that problem and solved it this way: I eliminated the form where the vba code was and imported the same form from a backup file made before.
I found yet another solution (at least in my case): In trying to find the error, I tested the application I created on a co-workers computer. This somehow reset whatever went haywire in the file. Afterwards I was able to open up the file on my computer again and everything worked as it should!
EDIT: I have realized that the error, im my case, seems to have been connected in some way to my using SendKeys (see my attempt to automate a report here on SO).
Had the same problem. I stumbled on the fix by accident. For whatever reason, simply adding an on-click Event Procedure made everything better.
Open the form in design mode
Select an object on the form
Press F4 to display the object's properties
Event > On Click > dropdown > click [Event Procedure]
Then click the three dots, which will create a new event, and launch the Visual Basic editor. This will also add default code into the Visual Basic editor
Make no other changes
Save and close changes to the form
Restart the database
For what its worth, as I was wrestling with this issue, the error resolved itself in other ways, but none of them were repeatable.
I had this problem as well, and compact/repair did not fix it. In my case I had an old VBA module that was no longer used, and which referenced an object class that no longer existed. Removing the non-compiling code fixed the issue for me.
I have had this problem for many years now in access 2010. Always in the Autoexec form that opens on msaccess startup. I tried creating a very simple form that calls the original more complex form. To my surprise the more problem moved the the new simple form. By trial and error, I found that just editing the new simple Autoexec form the problem would go away, but turn up randomly months later ALWAYS after I had made programming changes elsewhere. Sometimes instead of the file not found error, I get just get a crash out of access - but the solution is the same procedure - make a small edit to the autoexec file (just add new blank line will do). My project has come through many versions of access (2000 -> 2010). If there was some way to automate the editing of my autoexec form, then restarting access - this would serve as a workaround. I have not found any way as yet.
I have had this problem for years in my access database. I tried all the above solutions an they all fixed the problem, only to have the problem reappear sometime later - always after VBA code change. I discovered that decompiling and then recompiling ALWAYS FIXES this problem, and is the quickest and easiest way to do so. So I have concluded that there is a bug in way Office only partly compiles after program changes like macros and VBA code changes. After a number of changes the system gets 'unhinged' and throws up the 'file not found' error. Reading thru the fixes users have found in this blog supports my theory. Nearly all these fixes would probably cause some sort and recompile the unhinged code.
MY SOLUTION
In summary I have found the following..
Doing a Decompile (without a recompile) will get rid of the error - but if the code is run on a different machine the error appears again.
Doing a decompile, then a recompile followed by a Compact and Repair results makes my app run on other machines with out any problems.
I had a class module - Class1 - that was not used. I deleted it and did a compact and repair.
Something happened that caused the name of the class module to stay in the Navigation Pane but the module as such was removed:
When opening the VBA editor I got the "File not found".
Impossible to delete the name from the Navigation Pane!!
When decompiling the project I got "An error occurred while loading 'Class1'. Do you want to continue loading the project?"
I did - now the Class1 was still in Navigation Pane when opening project again but now I could delete from the Navigation Pane.
After that the message about file not found no longer appeared.
FYI