SQL Server: An error occurred while executing batch. Error message is: The directory name is invalid.

I logged onto the server this morning to delete some files because the disk had run out of free space. After deleting some files, I went to run some maintenance scripts in SSMS and received the following error:

An error occurred while executing batch. Error message is: The directory name is invalid.

After doing some online research, I found out that the reason for this error is because SQL Server cannot find the temp folder in which to store the query results. To correct this, try logging off and back on to the machine that you are running SSMS on. If the error persists, reboot the machine.