I am working on react native project.
It worked well before I reinstall computer OS.
Now if I run expo start it just show this.
Starting Metro Bundler on port 19001.
This takes forever.
If I run android emulator here, then this error appears.
Couldn't start project on Android: could not install *smartsocket* listener:
cannot bind to 127.0.0.1:5037: Only one usage of each socket address
(protocol/network address/port) is normally permitted. (10048)
could not read ok from ADB Server
* failed to start daemon *
error: cannot connect to daemon
What's wrong here? I am using Genymotion simulator.
I solved this.
I just set path environment to genymotion adb tool directory.
C:\Program Files\Genymobile\Genymotion\tools
And now it works well.
Thanks.
Related
screenshot of terminal
I'm using MacBook Air M1.
To make react-native work on a physical device with expo application, I wrote these codes:
npm install -g expo-cli
npx expo-cli init cars
cd cars
npm start
But it doesn't work, I'm looking forward your replies thank you.
Try to run expo start and make sure that port 8081 not used by any other server. Because in given screenshot it looks your port 8081 is already been used and on top of that you trying to run expo project thats why always failing.
I think your previous process is still running, try to stop those process and then start expo server again
Do this to stop the process:
Run this command for getting PID of the process running in your port 8081
lsof -i tcp:8081
Note the PID from the table which is shown after that command
Run this command to kill your process kill -9 {PID}.
kill -9 3421
You have to add your PID in place of 3421 that I used.
I Hope that it helps..
I've been looking for a solution to this issue for a day now but couldn't fix it.
I have not used react native for a month when everything was working fine.
Now, if I try to run an existing project that used to work (react native 0.59.5) or a brand new project (react native 0.59.9) with the iOS simulator on my mac, I get the error:
Failed to load bundle - Could not connect to development server
Any idea how I can fix this?
Ok found the issue. Was thinking it might be watchman related issue and wanted to use the command brew reinstall watchmanto reinstall it. By running this command, I found an error
Error: Xcode alone is not sufficient on Mojave. Install the Command Line Tools: xcode-select --install
Looks like the command line tools for xCode was not available anymore.
I launched the command xcode-select --install and then reinstalled watchman just in case. It is now working!
Couldn't connect to development server error
This error is received when the metro bundler isn't running in port 8081. To start the bundler, from project folder run:
npm start
Now, try reloading your app (ctrl + R for iOS / r+r for Android).
Also, check your terminal in case the project failed initial build due to some error.
When I run react-native run-android it builds successfully and there after
Mobile screen shows nothing more than loading from local host : 8081
I have tried adb reverse tcp:8081 tcp:8081
Start by closing the App on your phone and clearing phone memory.
Close metro bundler on your PC.
Then clear npm cache as follows: npm cache clean --force
Then clean up gradle as follows:
Change into android directory in your project folder: cd android
To clean clean gradle simply run: ./gradlew clean
cd .. back into your project's root directory.
Build your app again using whichever method suits you. My preferred method for RN apps without expo on a windows machine is as follows:
npx react-native run-android
Try either of these ways to fix it:
Try to Open Developer menu by press Ctrl + M in emulator and choose the Setting port, then input the value localhost:8081.
Try to connect the other wifi, then run 'adb reverse tcp:8081 tcp:8081'
Try to change the URL on chrome to http://localhost:8081/debugger-ui/
Cheer!
Samsung DeX!
Samsung DeX runs in the background to discover device connections, it uses port 8081. In my case, it interfered with Metro and adb reverse. Exiting the system tray app fixed the entire issue.
For some reason it was a watchman issue. I remember installing watchman a few days before and it was causing the issue. I uninstalled watchman and it worked.
Uninstalling watchman made it work for me.
When I run "react-native run-android",it gives me error:"could not connect to development server...".-- The red screen
OS: Windows 7
node version:8.2.1
npm version:4.1.2
react-native version:0.47.1
react-native-cli version:2.0.1
android device and emulator version: 5.1.1
i followed following command:
react-native init ProjectName
cd ProjectName
react-native run-android
And this makes the package server run automatically.
But I am not able to access the package server from browser on the machine and the mobile.
My android device connected to computer has debugging enabled i checked it using adb devices command.
Usb debug is on.
I tried running the project on real device and on emulator. On Both I got error: "Unable to load script from assets 'index.android.bundle' Make sure your bundle is packaged correctly or you're running a package server'.
reloading i get the error: "Could not connect to development server."
Then i set the host and port number on development setting on both and got the error "Could not connect to development server."
enter image description here
So how to fix the red error screen issue?Any suggestion is appreciated!
Try to open this link in browser. It will automatically bundle the assets.
http://localhost:8081/index.android.bundle?platform=android&dev=true&hot=true&minify=false
You development server should be running while running this command.
I am building an app using react-native and i was using android default emulator without any problems. The only issue i am having is the emulator is really slow.
I wanted to try genymotion and installed it. How ever when i run react-native run-android it cannot find the Genymotion Emulator. Here is the Error i am seeing in the console.
BUILD SUCCESSFUL
Total time: 8.329 secs
This build could be faster, please consider using the Gradle Daemon: http://gradle.org/docs/2.4/userguide/gradle_daemon.html
ADB server didn't ACK
* failed to start daemon *
error:
Starting the app (/home/hduser/Android/Sdk//platform-tools/adb shell am start -n com.legacitinative/.MainActivity...
error: no devices/emulators found
I am not sure why it cannot find the emulator.
Appreciate any help.
Thanks
Sateesh
$ cd /home/hduser/Android/Sdk/platform-tools
$ ./adb reverse tcp:8081 tcp:8081
Try if adb can see your device with
$ ./adb devices