I was installing OEM 13C R5 on oracle database 19c, in 91% of the install process, I had this error:
3. oraHome=C:\Agent_Base\agent_13.5.0.0.0
INFO: oracle.sysman.top.agent:Agent Home is : {0}
SEVERE: oracle.sysman.top.agent:Agent configuration has failed
INFO: oracle.sysman.top.agent:AgentConfiguration:agent configuration finished with status = false
INFO: oracle.sysman.top.agent:AgentConfiguration:agent configuration finished with status = false
INFO: oracle.sysman.top.agent:The plug-in Agent Configuration Assistant has failed its perform method