I facing error while simple VHDL code is simulation is done.

Hi,

Please provide more info on your OS, Modelsim Version (Downloaded from Intel website or Standalone version) etc.

Normally Permission denied cases come where the particular folder doesn't have write permission (If the pwd (present working Directory) is in C drive).

Try to change the working Directory to other directory using cd command after launching Modelsim.

With Regards,

HPB

I think you might need to setup the nativelink and simulation setting. You can refer to the link below:

https://www.intel.com/content/www/us/en/programmable/documentation/sam1412662001635.html#sam1412661740468

If invoke modelsim from Intel Quartus Prime Software, do you still see the same error?