無法提升網域 (或樹系) 的功能層級到要求的數值，因為在網域 (或樹系) 中存在一或多個網域控制站處於較低不相容的功能層級。

The functional level of the domain (or forest) cannot be raised to the requested value, because there exist one or more domain controllers in the domain (or forest) that are at a lower incompatible functional level.