Error (184057): Fitter cannot read the .mif db/<name>.mif - Error (184057): Fitter cannot read the .mif db/<name>.mif Description Due to a problem in the Quartus® II Software version 12.1 and later, you may see this error message when you have multiple revisions in your design. The Quartus II software incorrectly deletes the incompatible databases when a new revision is selected and you will see a message that the Memory Initialization File ( .mif ) is missing during fitting. Resolution To work around this problem, do the following: Delete the db and incremental_db folders Open the main revision Switch to the desired revision and compile 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 12.1 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']