Unable  to  checkout  a  license  .  Make sure your license file  environment  variables are set correctly and then run 'lmutil lmdiag' to diagnose the problem Modelsim-Altera uses the following enviroment variables to check the licenses (listed in the order of preference) 1Mgls_license_file 2Lm_license_file 请问这个怎么解决?  谢谢