Error while importing the FOB in NAV 2015

Hi All,

I am getting the below error while importing a FOB file in NAV 2015 Database:

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Microsoft Dynamics NAV Development Environment

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Unable to process table changes because the request cannot be processed by the specified Microsoft Dynamics NAV Server instance:

Server Name: XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Server Instance: XXXXXXXXXXXXXX
Management Port: XXXX

Check that:
1. The Microsoft Dynamics NAV Server is running
2. There is only one tenant mounted on the server instance.

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OK

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I am doing the import with Schema Sync option as: "Now - with validation".

Also my environment is not a multi tenancy environment. Checked the Service is running fine.

Any suggestions?

Thanks in advance!