Network problem: You can't log in to Qingguo app because the network connection is unstable or the network status is not good. At this point, you can try to reconnect to the network or change the network environment before trying to log in.

Server problem: unable to log in to qingguo app, which is caused by server failure or maintenance of qingguo app. At this time, you can try to wait for a while before logging in, or contact the customer service staff of Qingguo app for consultation.