Internal Error: Sub-system: FIOMGR, File: /quartus/fitter/fiomgr/fiomgr_io_power_region.cpp, Line: 2351 - Internal Error: Sub-system: FIOMGR, File: /quartus/fitter/fiomgr/fiomgr_io_power_region.cpp, Line: 2351 Description Due to a problem in the Quartus® II software version 13.0 SP1 and later, you may see this error if your design contains the following line in the Quartus II Settings File ( .qsf ) set_global_assignment -name FORCE_CONFIGURATION_VCCIO ON Resolution To work around this problem, comment out the line in the .qsf : 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 13.0.1 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']