仿真时出现这个错误ERROR: [USF-XSim-62] 'simulate' step failed with errors. Please check the Tcl console or log files for more information.查看原因是这个
ERROR: [Simtcl 6-50] Simulation engine failed to start: A valid license was not found for simulation. Please run the Vivado License Manager for assistance in determining which features and devices are licensed for your system.
Please see the Tcl Console or the Messages for details.