I'm having this error some times in ver 1.2, not seen in previous versions.
Would be nice if the error shows some more info, as filename.
Without filename I'm not able to see where is the problem, but I doubt that "my" filename was incrrect.
btw I was using automation with vb6.
As a suggerence you would consider the filename of the error file that includes date-time because otherwise new error delete old, also would be using the %temp% directory instead of ProgramFiles.
Thus %temp%\\PDFCreator_yymmdd_hhmmss.err