Unable to generate load for irregular slabs

Staad pro shows "cannot generate load for command" while assigning floor load for an irregular slab.

Tried to make those inclined beams in a group and then tried to assign a floor load of (-2.5 kN/m2) to that floor. but didn't work then. 

The marked portion is where the load needed to be applied. Please give the answer. 

Thank you.

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