Internal Error: Sub-system: PDB, File: /quartus/db/pdb/pdb_archive.cpp, Line: 2851 - Internal Error: Sub-system: PDB, File: /quartus/db/pdb/pdb_archive.cpp, Line: 2851 Description This error may be seen when opening an existing project or creating a new project in the Quartus® II software version 11.0 SP1 when the device installation files have been corrupted. Resolution To work around this problem, uninstall and reinstall the Quartus II software version 11.0 SP1. Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['FPGA Dev Tools Quartus II Software'] novalue 11.0.1 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']