that problem happened to be 2 times in the past and both times i reinstalled Ansys. but this time I went to the settings of SpaceClaim and then clicked on ADVANCED and then I clicked RESET ALL USER SETTINGS. IDK why this happens in 2020R2
I mean I have used 18.1 and 18.2 a lot but this never came up.
but I think the modeling inside the discovery live is bugging with the Spaceclaim because the grid is grey which is the color of grid in discovery live and it's not just the pull function that gets an error, literally any tool which has to be further selected like the tool FILL which we need to click the TICK  at the end to the tool to work
also, what's a working directory? What's the use of keeping it after I save my project through the workbench? what data does it contain?