[gembud] Product Generation

For some reason in NMAP2 whenever I try to invoke product generation I get an 
error message that 
says "Unable to invoke PRODUCT GENERATION 1) Product generation already in use 
or 2) Cleanup of 
previous NMAP error required. type <cleanvgf> in current directory".  Well I 
know product generation 
isn't already active, because there is a message at the bottom of the screen 
indicating as such, and 
running the cleanvgf program throws a bunch of errors because there are no old 
files laying around.  
Any ideas?

--Josh B.