Error adding table to report data definition

Getting a new error to me.

When saving after adding a new table to a RDD the following message occurs. Not sure where to start to look to debug. Has anyone seen this before?

Information Message Caught:

Information Message Detail:

Version: 0
Program: ReportDataDef
Method: AddExcludes
User: ken.nash
Company: EmbedTek
Site: MfgSys

Message: Sql Error .ctor: A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)
Severity: Information