lua code fails on require statement - module

Problem Description
I have some code that I've inherited and I'm trying to debug. It's a web application that is written in lua for the back end.
The system fails right now with an error that says the following:
398: attempt to call global 'require' (a nil value)
Code
Line 398 is the require statement you see below..
getstatus = function()
require("processinfo")
local value,errtxt=processinfo.package_version(packagename)
etc...
What I've tried so far:
I've tried to test to make sure that the package / module it's looking for exists. It does. It's in my lua lib folder
test-dev:/usr/share# find / -name processinfo*
/usr/share/lua/5.1/processinfo.lua
I've also launched the lua command line and tried to include the module, like so:
test-dev:/usr/share# lua
Lua 5.1.5 Copyright (C) 1994-2012 Lua.org, PUC-Rio
require("processinfo")
And it seems to be happy, no error messages.
Finally, I've tried to move the require statement from line 398 to the top of the file with the rest of the include statements that I have ... like so:
module(..., package.seeall)
posix = require("posix")
utils = require("utils")
processinfo = require("processinfo")
When I do that, the error message about the require statement goes away but instead i get an error about the string function I'm calling. The error message is :
139: attempt to index global 'string' (a nil value)
Line 139 is the opening of a while loop that looks like this:
while string.find(result, "%$[%w_]+") do
-- do something
end
Additional Information
Lua version is 5.1
this code is working on another server...

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That's indeed terrible way of error logging
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database is a subject of many errors itself.
You've been told already that it's impossible to catch a parse error at the program logic level, because a syntactically wrong program will never run.
Let's take your code as an example. It will raise a MySQL error (because of poorly formed query) which you will never see. As well as any other errors occurred. That's what I am talking about.