This error is most commonly seen when user do not set the standard
It is also possible that the license file (e.g., oplrqb.lic, sql_lt.lic) has been placed in a directory which is not included within OPL_LICENSE_DIR if set, or within PATH if OPL_LICENSE_DIR is not set.
Please refer to the instructions relevant to your license host to ensure that the license file has been properly applied.