Getting internal error error =500

Hi Support,

I setup Grafana with OEM (oracle enterprise manager) using the enterprise manager plugin.

installed supported grafana version 6.7.1 on OEM 13.4 and setup the data source successfully and tested.

But when i click on the default dashboard, i am getting internal error.

in logs also i saw this…
t=2020-06-19T08:28:20-0400 lvl=eror msg=“Request Completed” logger=context userId=1 orgId=1 uname=admin method=POST path=/api/datasources/proxy/1/em/websvcs/restful/grafana/v1/query status=500 remote_addr= time_ms=450 size=15 referer=“

I could not find the root cause yet. Could you please help me on wht should be wrong or i need to check.