Internal Error: Sub-system: SDR, File: /quartus/sld/sdr/sdr_tx_signal_nodes_gen2.cpp, Line: 781 alias != NULL && *alias != '\0' - Internal Error: Sub-system: SDR, File: /quartus/sld/sdr/sdr_tx_signal_nodes_gen2.cpp, Line: 781 alias != NULL && *alias != '\0' Description Due to a problem in the Quartus® II software version 13.0 SP1 and earlier, you may see this internal error in the SignalTap™ II Logic Analyzer when deleting an alias for a node. Resolution To work around this problem, perform the following steps: Close the SignalTap II Logic Analyzer Open the SignalTap II file ( .stp ) in a text editor and delete all the lines matching .alias= “<name>” Reopen the SignalTap II Logic Analyzer Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['FPGA Dev Tools Quartus II Software'] novalue 13.0 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']