エラーが発生しました。

close Connection error: could not connect to server: Connection refused Is the server running on host "localhost" and accepting TCP/IP connections on port 5432? could not connect to server: Connection refused Is the server running on host "localhost" and accepting TCP/IP connections on port 5432? could not connect to server: Connection refused Is the server running on host "localhost" and accepting TCP/IP connections on port 5432?