What is the cause of this message?

After configuring FabricPath, the following appears in the syslog:
%STP-2-L2GW_BACKBONE_BLOCK: L2 Gateway Backbone port inconsistency blocking port port-channel100 on VLAN0010.
What is the cause of this message?
A. STP must be disabled; message indicates that STP is enabled.
B. STP is misconfigured; root guard must be disabled.
C. An inferior BPDU is received on a Cisco FabricPath edge port.
D. A superior BPDU is received on a Cisco FabricPath edge port.

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