C#.net 2008 postbuild Error 19 exited with code 1I

I am hoping you can help me figure out my is causing my error message.
In a C#.net 2008 application, I am getting the following error message from the postbuild event when I try to compile an application:

Error 19 The command "C:\enrol\EnrollT.PostBuild\bin\Debug\\EnrollT.PostBuild.exe
Debug" exited with code 1.
 The acutal code is the postbuild event is:
 $(SolutionDir)EnrollT.PostBuild\$(OutDir)\EnrollT.PostBuild.exe $(ConfigurationName)

The postbuild event somehow translates to:
C:\enrol\EnrollT.PostBuild\bin\Debug\\EnrollT.PostBuild.exe
Debug"