Error Message: "Unable to open a Request Broker license (License not found)," or simply "License not found" This error is most commonly seen when user do not set the standard OpenLink environment properly (e.g., by running the openlink.sh or openlink.csh script), and/or do not start the OpenLink License Manager before starting the licensed product (e.g., Multi-Tier Request Broker, any Single-Tier client driver, Virtuoso server instance).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.