legion: Print a right error message when the physical tracing started with an unsupported operation
legion: Print a right error message when the physical tracing started with an unsupported operation

StanfordLegion/legion,StanfordLegion/legion,StanfordLegion/legion,StanfordLegion/legion,StanfordLegion/legion,StanfordLegion/legion,StanfordLegion/legion,StanfordLegion/legion