Internal Error: Sub-system: SDR, File: /quartus/sld/sdr/sdr_tx_signal_nodes.cpp, Line: 186 - Internal Error: Sub-system: SDR, File: /quartus/sld/sdr/sdr_tx_signal_nodes.cpp, Line: 186 Description Due to a problem in the Quartus® II software version 12.0 and later, you may see this internal error when dragging the nodes from the Technology Map Viewer to the SignalTap™ II Logic Analyzer. Resolution To work around this problem, perform one of the following two options: In the Technology Map Viewer, right-click on the desired nodes and select Add Node to SignalTap II Logic Analyzer option and then select a new or existing SignalTap II ( .stp ) file. Add nodes within the SignalTap II Logic Analyzer by double-clicking on any empty space in the node list pane and opening the Node Finder. This problem is scheduled to be fixed in a future release of the Quartus II software. Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['FPGA Dev Tools Quartus II Software'] novalue 12.0 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']