'Display error message on Sphinx rich text failure'

def _on_sphinx_thread_error_msg(self, error_msg):

    self._sphinx_thread.wait()
    self.plain_text_action.setChecked(True)
    sphinx_ver = programs.get_module_version('sphinx')
    QMessageBox.critical(self, _('Help'), (_('The    following    error    occured    when    calling    <b>Sphinx    %s</b>.    <br>Incompatible    Sphinx    version    or    doc    string    decoding    failed.<br><br>Error    message:<br>%s') % (sphinx_ver, error_msg)))
