Internal Error: Sub-system: GIOQ, File: /quartus/edt/gioq/gioq_file_db.cpp, Line: 1865 - Internal Error: Sub-system: GIOQ, File: /quartus/edt/gioq/gioq_file_db.cpp, Line: 1865 Description Due to a problem in the Quartus® II block design/schematic editor, if you draw a line and press the Esc key before releasing the left mouse button, a visible non-functional wire is created. If you try delete the wire, you may see the above internal error. Resolution To avoid this problem, do not press the Esc key before releasing the left mouse button when drawing wires. This problem is fixed beginning with the Quartus II software version 12.1. Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['FPGA Dev Tools Quartus II Software'] 12.1 10.0 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']