I include VFP 9 report components into my application exe.
To create HTML file I issue command

LOCAL olistener
DO frxoutput WITH 5, olistener
IF varTYPE(olistener)#'O'
  messagebox('Dont know why report listener object creation fails')
  endif

In some customer computers, olistener does'nt have type O and thus html reports cannot be created. This occurs in Windows XP with all updates installed.
There are NO any error message or log file which explain the cause of failure.
I send my application to customers and I don't have acces to those computers.

How to determine the reason why report listener object is not created?