If you are receiving the above error, please make sure you are using a valid VHDL license. Your license file should have the RIVIERA_VHDL_SIMULATION feature. To see all available features, select Help | License Diagnostics from the main menu of Riviera-PRO. Scroll to the right to see the Feature name column.
NOTE: If you have a Verilog license, you will not be able to run a VHDL simulation.
If you have a VHDL license and are still receiving this error, please contact our support team through our Support Portal.