I've been following the upgrade process from 3.0 -> 3.1 but I'm getting an error which I cannot figure out:

Server Error in '/' Application.
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Compilation Error
Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.

Compiler Error Message: CS0103: The name 'CMSFunctions' does not exist in the current context

Source Error:

Line 97: {
Line 98: // Initialize the environment
Line 99: CMSFunctions.Init();
Line 100:
Line 101: // Update the system !! IMPORTANT - must be first

Any suggestions? The only part I altered in the web.config file was the connection string (as instructions state to do).