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Undefined error message


If I use literal ASCII values in the rules, the parser builder complains that I need to declare the tokens. When I create a list of tokens, with literal ascii values, after a certain number I get an odd error message.

c:>....\gplex\gplex-distro-1.2.1\binaries\Gppg.exe /babel /conflicts /defines /errorstoconsole /gplex /listing /out:X680parse-e.cs /report /verbose /no-lines x680e.y

Unexpected Error The given key was not present in the dictionary.
GPPG: opened listing file <x680e.lst>

Does anyone have a clue what that is or how to solve it?