RCDC. I am getting a error: Error in Model. Cannot detect slabs

STAAD version 22.08.00.175, RCDC 11.01.00.18.  I have modelled a building in STAAD. I was able to design beams , columns , footings using RCDC. But when I import the STAAD file for designing slab, I am getting a error: Error in Model. Cannot detect slabs. Later on it shows layout of slError slab design.STDabs. after clicking ok, file closes. What's the solution for this?

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