Pre-Processor run-time error

I'm trying to run the pre-processor (prew2_cfv.exe) on my model of a river system with no water quality constituents (I'm only interested in temperature). However the pre-processor doesn't get very far. I get a visual fortran run time error: forrtl:severe (64): input conversion error, unit 21, path to my job control file - and then a bunch of unknown Images are listed. This seems to occur at the array dimensions step in the pre-processor. I used the Spokane River example as my template and have checked to make sure my formatting is right and have the same number of water bodies, branchs, layers etc as what are in my bathymetry files. Does anyone have a suggestion at where I should specifically look to fix this error? Greg