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When I try to compile my project, I receive the following error message: "Invalid Command Call (HC31.EXE)"

The following reasons can cause this message:

  1. There is no Microsoft Help Compiler at your computer.
    To create a Help file (.HLP) from  your project hyperbase, you  need a Microsoft Help Compiler (e.g., HC31.EXE, HCP.EXE or HCW.EXE).
    A Help Compiler is not supplied with Visual Prolog, but it can be found in the Visual C++, the Borland C++, and many other products.
    If you do not have any mentioned Help compiler versions, it may be worth checking out the Softlib directory at ftp.microsoft.com or trying the following URL: ftp://ftp.microsoft.com/Softlib/mslfiles/hc505.exe.
      
  2. HC31 Help Compiler, set by default in the Application Expert, is missed at your computer.
    You need to set a Help compiler installed at your computer in the Help Maker tab of the Application Expert (Options | Project | Application Expert menu item).
      
  3. The path to the Help Compiler is not set or includes blank characters.
    You need to set a path to this Compiler with the help of Options | Global | External Tools Directories item. If the Path contains blank characters or sub-names longer then 8 chars, you should edit them to satisfy DOS naming conventions.

For example, if you have the following path:

C:\PROGRAM FILES\RoboHelp98 ,

you should edit this path in the following way:

C:\PROGRA~1\RoboHe~1