In rare circumstances, the TimeQuest Timing Analyzer can fail with an internal error: Sub-system: QSTA, File: /quartus/Taoism/qsta/qsta_sta_interface.cpp, Line: 1189 - In rare circumstances, the TimeQuest Timing Analyzer can fail with an internal error: Sub-system: QSTA, File: /quartus/Taoism/qsta/qsta_sta_interface.cpp, Line: 1189 Description By default, the Assembler and the Time Quest Timing Analyzer run in parallel during full compilation. In rare circumstances, parallel compilation can cause the Time Quest Analyzer to fail with an internal error similar to the following: Internal Error: Sub-system: QSTA, File: /quartus/Taoism/qsta/qsta_sta_interface.cpp, Line: 1189 Resolution If you encounter this error, disable parallel compilation by adding the following line to your project\'s Quartus II Settings File (.qsf): set_global_assignment -name FLOW_ENABLE_PARALLEL_MODULES Off and then re-run timing analysis. Custom Fields values: ['novalue'] Troubleshooting novalue True ['novalue'] ['FPGA Dev Tools Quartus II Software'] novalue 11.0 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']