@Override
  @NotNull
  public DiffContent createDiffContent(@Nullable Project project, @NotNull ProgressIndicator indicator)
    throws DiffRequestProducerException, ProcessCanceledException {
    throw new DiffRequestProducerException(myMessage);
  }
@Override
  @NotNull
  public DiffContent createDiffContent(@Nullable Project project, @NotNull ProgressIndicator indicator)