Why do I get this error (vcom-1136) Unknown identifier "width_eccstatus" when compiling the FIR simulation model in Modelsim? - Why do I get this error (vcom-1136) Unknown identifier "width_eccstatus" when compiling the FIR simulation model in Modelsim? Description This error is causing by using wrong version of Modelsim. You have to ensure the version of Modelsim is compatible with the Quartus® II software. For Quartus II version 10.1sp1, this is compatible with the Modesim version 6.6d. You can verify which version of Modesim should be use with the installed Quartus II software from Altera® software Download Center. Here is the link of the Download Center: https://www.altera.com/download/dnl-index.jsp Custom Fields values: ['novalue'] Troubleshooting novalue False ['novalue'] ['novalue'] novalue novalue ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']