新手求指点！！在做例题的时候总是出现错误

Thermal contact has been defined between the surfaces ASSEMBLY_PAD-DOWN and ASSEMBLY_DISK-UP, but no temperature degrees of freedom associated with the surface ASSEMBLY_PAD-DOWN.
刹车盘热分析那个例题，我查了好几遍了眼睛都瞎了，求求你告诉我可能在哪个步骤的哪个地方可能的错误吧！！求求你了！只要你认为可能错的都告诉我