Sergey,

It works modular but if error is inside the form, it does not. I don't know why?

The errtrap program is successfully invoked but parameters are always .F.

>I just ran following code and all functions worked as advertised

ON ERROR DO ERRTRAP WITH ERROR(), PROGRAM(), LINENO()
>
>a = b
>
>RETURN
>
>PROCEDURE ERRTRAP (nErrorNo, cProgram, nLineNo)
>
>cMsg = "Error number : "+ALLTRIM(STR(nErrorNo))+CHR(13)+;
>       "Origin       : "+cProgram+CHR(13)+;
>       "Description  : "+MESSAGE()+CHR(13)+;
>       "Line number  : "+ALLTRIM(STR(nLineNo))
>
>Wait WINDOW cMsg

>
>>Modified Thread:
>>

>>ON ERROR DO ERRTRAP WITH ERROR(), PROGRAM(), LINENO()
>>
>>PROCEDURE ERRTRAP (nErrorNo, cProgram, nLineNo)
>>
>>cMsg = "Error number : "+ALLTRIM(STR(nErrorNo))+CHR(13)+;
>>       "Origin       : "+cProgram+CHR(13)+;
>>       "Description  : "+MESSAGE()+CHR(13)+;
>>       "Line number  : "+ALLTRIM(STR(nLineNo))
>>

>>I didn't change anything in VFP7 but why is it that nErrorNo, cMessage, nLineNo variable parameters no longer contains expected value. It always returs .F. always.
>>
>>TIA