laravel jwt刷新token

jwt刷新token时 JWTAuth::refresh($old_token) 报出异常The token has been blacklisted，这个是什么原因
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public function refreshToken(Request $request){

    try {
        $old_token = JWTAuth::getToken();
        $token = JWTAuth::refresh($old_token);
        JWTAuth::invalidate($old_token);
    } catch (TokenExpiredException $e) {
        return response()->json(['token_expired'], $e->getStatusCode());
    } catch (JWTException $e) {
        return response()->json(['error' => 'could_not_create_token'], 500);
    }
    return response()->json(compact('token'));
}

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