For more info about how VFP handles errors see the following topic from the VFP Help:
Handling Run-Time Errors
http://msdn.microsoft.com/library/en-us/fox7help/html/dgHandling_Run_Time_Errors.asp

Error event (it is event not method)
http://msdn.microsoft.com/library/en-us/fox7help/html/lngError_Event.asp

Handling SQL Pass-Through Errors
http://msdn.microsoft.com/library/en-us/fox7help/html/dgHandling_SQL_Pass_Through_Errors.asp

Though you may already know this (or may have read this articles - read them again)

HTH