XNFPREP ERROR 3649: The signal '[sig_name]' has multiple sources.
A possible cause of this problem is due to an error in the Orcad library for the CC8CLED component. The library macro has the output of the Q5 register connected to the COUT pin of the CY4 carry logic component. This connection of 2 outputs together is illegal, and causes the error about multiple sources.
Possible workarounds are:
1.) Use the CC16CLED instead. The software will trim out any unused bits of the counter.
2.) Save the CC8CLED macro to your own user-library, and then edit the macro's schematic to fix the bad connection.