Error when executing GetDatasetParentLocation

1842.MRTOMO> p tango_io("id19/metadata/tomo","GetDatasetParentLocation")
omniORB: (0) 2018-10-09 15:48:15.814697: From endpoint: 
giop:unix:/tmp/omni-opid19/000024275-1539092055. Detected GIOP 1.2 
protocol error in input message. giopImpl12.cc:173. Connection is 
closed.
omniORB: (0) 2018-10-09 15:48:15.817165: From endpoint: 
giop:unix:/tmp/omni-opid19/000024275-1539092055. Detected GIOP 1.2 
protocol error in input message. giopImpl12.cc:173. Connection is 
closed.
Error on "id19/metadata/tomo":  API_CorbaException.
-1