Preprocessor Error

The preprocessor is crashing when I run it on my model. I have traced the error to the subroutine "input_error" in the pre_cvf.f90 source file. The output file unit variable WIN is defined as 5 in this subroutine and it was previously defined as 6 in the main program. Should the variable WIN be changed to 6 in this subroutine, or should this error output message be written to a different unit number?