swoole的task，调用协程Redis报错，求解~~~

Question

swoole_http_server下的ontask方法里面，调用Swoole\Coroutine\Redis出现，PHP Fatal error: Swoole\Coroutine\Redis::connect(): must be called in the coroutine，请问是咋回事呀？是只能在onRequest下面调用嘛？