@Override
  public ExternalProjectsStructure.ErrorLevel getErrorLevel(DataNode<?> dataNode) {
    if (ProjectKeys.LIBRARY_DEPENDENCY.equals(dataNode.getKey())) {
      if (((LibraryDependencyData)dataNode.getData()).getTarget().isUnresolved()) {
        return ExternalProjectsStructure.ErrorLevel.ERROR;
      }
    }
    return super.getErrorLevel(dataNode);
  }
@Override
  public ExternalProjectsStructure.ErrorLevel getErrorLevel(DataNode<?> dataNode)