The nature of the last error. Provides interpretation context for gmplsTunnelErrorProtocolCode and gmplsTunnelErrorProtocolSubcode. A value of noError(0) shows that there is no error associated with this tunnel and means that the other objects in this table entry (conceptual row) have no meaning. A value of unknown(1) shows that there is an error but that no additional information about the cause is known. The error may have been received in a signaled message or generated locally. A value of protocol(2) or pathComputation(3) indicates the cause of an error and identifies an error that has been received through signaling or will itself be signaled. A value of localConfiguration(4), localResources(5) or localOther(6) identifies an error that has been detected by the local node but that will not be reported through signaling.