Unable to start although DB connection is configured properly

Unable to start although DB connection is configured properly

I am using CentOS 7 64bit server and DB connection to PostgreSQL is configured properly, but when I try to start it's appear below.

Starting Server from location: /root/ManageEngine/ServiceDesk
Free edition...

Unable to start Postgres server on port 5432, since another instance
of postgres is running in this port.

System halted


Problem while Starting Server

Please help me about this problem.

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