Why is the Corporations NOT Building?

whya is the Corporations, that I have Qued to Build or on the list to build in Independent State of Sparta not building. I have the employment force needed for the wanted Corps " State Built Corporations." To build?

Please check is you have a production plant.

it chould be the reason for not building.
there are probably shortages on the market.

please check the trade page to see your outstanding orders.