The geometric tolerance references an invalid datum reference frame (DRF). This problem can be caused by a change to the model that caused datum features that the DRF references to become invalid.
A DRF is often invalid because it references an invalid feature (the feature is missing surface references). Invalid DRF's and geometric tolerances in the model can usually be repaired by repairing the invalid features in the model. The best method for repairing a model with invalid objects is to repair invalid objects in the following order: