SignalStorm: Help on warning "illegal instance is found"

[kristof]

I'm working with Signalstorm library characterizer. I do:
db_install (works)
db_gsim (FAILS) I get the message:
[WARNING(db_gsim)]BUFBD1 : illegal instance is found

=> no simulation


Does anyone knows what this message means? I can't figure it out. I
think it has something to do with the spectre-models because when I use
other ones I don't get this warning

Thanks
Kristof