Explode a solid created in Dynamo



I’ve created a lot of solids in Dynamo and then i exploded them in Revit. No problems until now, that i can’t explode one specific solid . It gives this error :

“Import contained 3D data or points which can’t be exploded. Only 2D data was exploded.”

I don’t get it, i did exactly the same i did in previous solids…