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   999    Attempt to execute invalid code

   Clipper has attempted to execute something that it doesn't recognize as
   valid clipper code.  This error can occur if an attempt is made to
   execute code compiled with a new version of Clipper under an older
   version, or because of a corrupted or invalid executable.

   Make sure that all code is compiled under the same version of Clipper,
   and is being linked with the correct version f the libraries.  If a
   third-party linker is used, see if the error occurs when using RTlink
   for Clipper.

   If a corrupted executable is suspected, recompile all OBJ files and
   relink.