What does the oPE08 parameter selection error mean and how do I resolve it?

The oPE08 error indicates a Parameter Selection Error caused by incompatible parameter settings when A1-02 = 6 [PM Advanced Open Loop Vector]. This occurs either when n8-57 = 0 and n8-94 = 1 [Feedback] are used together, or when b7-01 [Droop Control Gain] is not 0.0 and n8-94 = 0 [Reference] at the same time. The solution is to correct the conflicting parameter settings. (Page 3)