Dear David:
Note that HEC-2 <=> WSPRO Conversion Program is written in FORTRAN, and as such you must use a standard MS-DOS directory path for your data files. You cannot have any spaces in the path names, and the sub-paths cannot be longer than 8 characters. Also, deeply nested paths may not work, either. The Conversion Program will not run in these situations.
Otherwise, look for non-standard records that might be contained in your WSPRO model that the Conversion Program might be confused by.
Sincerely,
Chris E. Maeder, M.S.
Senior Technical Engineer
chris.maeder@bossintl.com