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in the meantime I had several other error messages (internal error...) on the same topic. Altera helped me to solve the problem. I had a bidirectional port, which can't be captured by SignalTap when incremental compilation is not disabled. As I can't disable or enable incremental compilation in my Web Edition, I have to add the statement >>set_global_assignment -name INCREMENTAL_COMPILATION OFF<< in the .QSF file. Now it works :)
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You probably made something unusual that exposes a bug in Quartus.
I can tap bidirectional pins on the Web Edition without any need to add that assignment.
Honored Contributor
