What does this mean?
"Error STAAD built in memory block has overflowed"
It suggests that the memory required to analyse this structure is greater than the default one. It happens for structures with high number of members, nodes, plates and load case and combinations.
As suggested try putting "Memory 365" command ahead of STAAD Space and try running the file. If you still face the issue please shrae the model here. i am assuming you are using the latest version i.e. 22.06.00.138. if not please upgrade to this version and check.
I did try but it is still showing error as below snap shot.
Try using MEMORY 505. If this does not help, attach the model please.