SCCM Configmgr the source directory doesn’t exist or the SMS service cannot access it, Win32 last error = 5

Setting up new SCCM Configmgr Current Branch 1606 in production environment .As part of it ,have created source folder (repository for content store) and placed couple of packages/applications for testing . while trying to distribute the packages, all failed with same error code. The source directory \\servername\sources$\Applications\Microsoft\SCUPCert doesn't exist or the SMS service cannot access…