Posted by ErmanArslansOracleBlog on Oct 23, 2020; 9:34am URL: http://erman-arslan-s-oracle-forum.124.s1.nabble.com/please-help-me-to-start-oracledbconsoleorcl-tp8921p8925.html
This error is generic.
Check the OMS logs...(Check OEM Logs which located in OMS_HOME\sysman\og.) We need to see how it fails.. The return code..