Why do I receive an error message when generate the FIR compiler? - Why do I receive an error message when generate the FIR compiler? Description You may receive the following error message when generating the FIR compiler by using 64 bit of Quartus. Error Message: java.io.FileNotFoundException: C:\Users\username\AppData\Local\Temp\ncg_886961157648532613\mcv_fir_coef.txt (The system cannot find the file specified) Resolution Please go to control panel -> system -> Advance -> Environment Variables In the User variables: Please ensure the “PATH” variable is included the “%QUARTUS_ROOTDIR%\bin” correctly. In the System variables: Please ensure the QUARUS_ROOTDIR is pointed to the Quartus II version that you are currently using. E.g. D:\Altera\11.1SP2\quartus Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['novalue'] novalue novalue ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']