Before I have this error message and I was able to correct the error in my program:

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This program has performed an illegal operation and will be shut down.
If the problem persists, contact the program vendor.
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But now I have this error message again. How do I trap the error when this error message appears?
Consider my error handler routine in my program:

lcOnError = 'Error number:'+LTRIM(STR(ERROR()))+' ,Line number:'+LTRIM(STR(LINENO()))
ON ERROR MESSAGEBOX(message()+chr(13)+ lcOnError,16,"System Error")

I am using VFP5

Please HELP!