em console is in inactive state and em console it is not opening

It was observed “EM” application was not active under deployments section also have seen LDAP errors in Admin log.
So I have brought down Admin server and took backup of changelog.data & changelog.index files under $DomainHome/servers/AdminServer/data/ldap/ldapfiles and removed them.
Restarted the admin server successfully, After this activity EM application is active and able to access the “EM” console.
Error from Server Logs:
<Error> <EmbeddedLDAP> <hostname.abc.com> <AdminServer> <VDE Replication Thread> <<anonymous>> <> <bc4be7ee-e9
70-4d24-b7e5-42a89a9f80a1-000000bf> <1556530851514> <[severity-value: 8] [rid: 0] [partition-id: 0] [partition-name: DOMAIN] > <BEA-000000> <Agreement ‘osb_server1’: In
valid Changetype: 64in change#167764>
####<29-Apr-2019 10:40:51 o’clock BST> <Error> <EmbeddedLDAP> <hostname.abc.com> <AdminServer> <VDE Replication Thread> <<anonymous>> <> <bc4be7ee-e9
70-4d24-b7e5-42a89a9f80a1-000000bf> <1556530851539> <[severity-value: 8] [rid: 0] [partition-id: 0] [partition-name: DOMAIN] > <BEA-000000> <Agreement ‘osb_server1’: In
valid Changetype: 64in change#167765>

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