Hello, * Since D08 slab in the basement has no connection with other slabs, it is detected as a separate rigid diaphragm. If you want to solve based on the assumption of a single rigid diaphragm on the floor, select all tiles and click the object properties command. In the Tile Settings dialog that opens, in the static tab check 'Automatically generate rigid diaphragm regardless of connection'. *In order to solve the joint shear safety problem in S9 and S10 columns, adjust the misalignment of K8 and K10 beams to 24 cm. make it defined. Good work