def METHOD_NAME(self):
    """
    Show the error files of the task
    Return None if no error is found so that we don't show this view in the GUI.
    """
    col = pn.Column(sizing_mode="stretch_width"); cext = col.extend
    count = 0
    for fname in ("stderr_file", "mpiabort_file", "qerr_file", "qout_file"):
        file = getattr(self.task, fname)
        if file.exists:
            text = file.read().strip()
            if text:
                cext([f"## {fname}",
                     pn.pane.Markdown(f"```shell\n{text}\n```"),
                     pn.layout.Divider()
                     ])
                count += 1
    return col if count > 0 else None