def invalid_config_error_message(action, key, val):
if action in ('<STR_LIT:store_true>', '<STR_LIT>'):<EOL><INDENT>return ("<STR_LIT>"<EOL>"<STR_LIT>"<EOL>"<STR_LIT>").format(val, key)<EOL><DEDENT>return ("<STR_LIT>"<EOL>"<STR_LIT>"<EOL>"<STR_LIT>").format(val, key)<EOL>
Returns a better error message when invalid configuration option
    is provided.