Just like DT's interrupt routines, you some times need to comment out a few lines in the include file

Look inside "SSPWM.inc"

Code:
' --- IF any of these three lines cause an error ??  Simply Comment them out to fix the problem ----
wsave1      var byte    $A0     SYSTEM          ' location for W if in bank1
wsave2      var byte    $120    SYSTEM          ' location for W if in bank2
wsave3      var byte    $1A0    SYSTEM          ' location for W if in bank3
' ------------------------------------------------------------------------------