I m working on in cylinder model. The simulation runs preety good. but the files i save during simulation using Autosave will not open. When i try to read the case and data file it just gives me null point domain error. Can somebody help me with this

Thanks Trushant

free disk space may be the cause

thanks Ahmed.. i tried it and its working. but now i tried to change the valve lift and changed the mesh. when i read file to fluent the grid check will fail and if i repair it and close it and then read the case it again gives null point domain error. Can u help me with that? anybody?

Thanks