fix callback definition
fix callback definition
GMOD/jbrowse,GMOD/jbrowse,erasche/jbrowse,erasche/jbrowse,erasche/jbrowse,nathandunn/jbrowse,nathandunn/jbrowse,erasche/jbrowse,GMOD/jbrowse,erasche/jbrowse,GMOD/jbrowse,GMOD/jbrowse,erasche/jbrowse,nathandunn/jbrowse,erasche/jbrowse,nathandunn/jbrowse,nathandunn/jbrowse,erasche/jbrowse