providers/core/core.peerconnection.js
function (dataChannel, info, err) {
        console.error(dataChannel.peerName + ": dataChannel(" +
                      dataChannel.dataChannel.label + "): error: ", err);
      }
function (dataChannel, info, err) {
        console.error(dataChannel.peerName + ": dataChannel(" +
                      dataChannel.dataChannel.label + "): error: ", err);
      }
function ( dataChannel , info , err ) { console . error ( dataChannel . peerName + ": dataChannel(" + dataChannel . dataChannel . label + "): error: " , err ) ; }
Default on error, prints it.
Default on error prints it .