Presumably you are in fact using a 3rd party lib. Try removing everything from your userlibs directory and compiling; if you then get the userlib not found error on your machine you know that you are using one of the libs you removed.
Userlib Not Found ?
Blitz3D Forums/Blitz3D Beginners Area/Userlib Not Found ?The forum is locked. These are the original blitzbasic.com forums, kept so they can still be read. No new topics, replies or edits can be made here. To join in, head over to the Blitz3D+ forums.