def _table_error(show, subcorpora, updating):
    """
    Check for problems with table
    """
    if updating:
        return ''
    errors = []
    if not show:
        errors.append('No choice made for feature to use as columns.')
    if not subcorpora:
        errors.append('No choice made for feature to use as index.')
    if not errors:
        return ''
    plural = 's' if len(errors) > 1 else ''
    return f'Error{plural}\n* ' + '\n* '.join(errors)
