While trying to access databases, logins, etc in SQL Server Management Studio 2008 R2, below error is always popping up. I browsed over google to find out a solution but those resolutions did not solved below issue. I have sufficient permissions and have enough disk space. When clicked on any entity in Object Explorer of SQL Management Studio the below exception appears.
Once you made the space, close your Management Studio and goto services.msc and restart the SQL Server () service, that will resolve your issue.