Why do I see a fatal error in the SignalTap II Logic Analyzer? - Why do I see a fatal error in the SignalTap II Logic Analyzer? Description Due to a problem in the Quartus® II software version 12.0 and later, you may see a fatal error while triggering the SignalTap™ II Logic Analyzer on a Windows computer. Resolution This problem is fixed beginning with the Quartus II software version 12.1. Download and install this version to avoid this error. Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['FPGA Dev Tools Quartus II Software'] novalue 12.0 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']