TypeError: a is undefined

I am getting the following using dhtmlxGrid: TypeError: a is undefined
I may have exhausted my ability to find what is causing this error. I have been unable even to narrow it down to a specific file. If you can help me with this, I assume the place to start would be accessing the site, which is password protected. What information do you need from me, and how do I get it to you? Thanks.

Please share the full error message as it logged in the browser’s console.
It will contain exact line and column of code where an issue occurs.

Thank you. About the time I saw this, I found the problem, thru the use of javascript alerts placed in critical places. I will remember next time to provide the information you suggested.