My computer has been having this pop up frequently in the past few days:

"A Runtime Error has occurred. Do you wish to Debug?
Line: 1
Error: 'a' is null or not an object"

Then you have to click Yes or No or just "X" the box out. What does this mean, and should I click yes or no? Thanks for any help I can get.

Run time errors occur in scripted or interpreted languages while a program is executing and a fatal condition (requires the program to stop) without an error handler is encountered. In this case, use of a pointer or object reference (programming constructs) that was null (meaning not properly initialized) was attempted.

Debugging allows a programmer to troubleshoot the error and requires debugging software tools to be installed. Choosing 'yes' would pull up the registered debugger application if installed. Choosing 'no' doesn't. If you aren't coding the code that is failing, choose 'no'.

If these errors are appearing while using a web browser, updating the browser or JAVA to a later version, or using a different browser may resolve the error. Most browsers also have an option in their advanced settings for disabling script debugging so errors are never seen. Something still doesn't work correctly, the browser just keeps it to itself. The error message should indicate what runtime or application owns the error.