I'm trying to recompile on PBP v2.60 a program that was originally compiled under PBP v2.50a, it uses USB on a 18F4550, I get the following Assembler errors

Error[113] c:\pbp\pbpic18.lib 715:Symbol not previously defined (USBDeviceInit)

I get this twice and then similar for USBDeviceTasks and PutUSB

The original code had usb18.asm, usb18.inc, usb18mem.asm and usbdesc.asm with the pbp source files (I think these are the same as in the USB18OLD directory under C:\pbp) I have read the USB.txt in the USB18 directory and have tried adding usb_dev.asm, usb_dev.inc etc to the source directory but still get same errors.

I'm also a bit new to USB so I maybe missing something simple........