Microsoft SQL Server, Error:53

Question

Hello I am facing while connecting to SQL Server 2012 Express like 

"A Network-related or instance-specific error occured while establishing a connection to SQL Server. The server was not found or was not accessible.Verfy the instance name is correct and the SQL Server is configured to allow remote connection. (provider: Named Pipes provider:40-could not open a connection to SQL Server) (Microsoft SQL Server, Error:53) ".

 

How to resolve it ?