Lectora 2008 button issue

i get the error when editing, not when publishing. can't even get that far. it must be a code within my course because i had a peer try my course and it gave him the error too. he doesn't get the error if he edits one of his courses. i get the error when editing, not when publishing. can't even get that far. it must be a code within my course because i had a peer try my course and it gave him the error too. he doesn't get the error if he edits one of his courses.

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