Unable to save to drawing as accessed by another session
I am using AutoCAD. It gives me an error message while I try to save a file. I am not able to continue working on it. Does anybody know why this happening is and how it can be removed? Please let me know thanks
AutoCAD LT Message
Unable to save to drawing x:Oakland PortalDesing DevelopmentBuildings D.1 and D.2A-2. First Floor Plan D2.dwg as it is being accessed by another session.
Drawing saved to x:Oakland PortalDesing DevelopmentBuildings D.1 and D.2sav1D8.tmp