There are two socialist calculation problems:
Hayek: Knowledge is distributed in the minds of individuals with specialized knowledge of particular circumstances of time and place. That knowledge can't be centrally collected and analyzed, meaning centrally-planned economies will inevitably make uninformed decisions that result in inefficiency.
Mises: With all industry owned by government, materials would be traded government-to-government, meaning there's no market for the determination of prices. Without the price mechanism, resources would be allocated inefficiently.