This is a typical error that happens if the usb-stack does not find your printer. Make sure that the printer is switched on and is found by the usb-stack.
I gather your advice is directed soley at Steffan from a developer standpoint?
Yes.
Quote:
Because depending on version of Tunenet and MPlayer used, failure to install threads.library will produce system error message "Can't open threads.library"
Added: Located another thread which also indicated (as of February, 2009) that the transmission bittorrent client also requires threads.library.
All that programms should be updated to use pthreads.library.
pthreads.library is part of OS4 since V52. samo97's link points to threads.library that was superseded by pthreads.library and should not be used anymore.