Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

You are attempting to run the program after you have
unloaded the main module. Every program must have a main
module so QuickBASIC knows where to start running the
program. Either
  ■ Use the Load File command from the File menu to
    reload the main module you unloaded. Or,
  ■ Use the Set Main Module command from the Run menu
    to assign the role of "main module" to one of the
    currently loaded modules.