This could be due to the internet connection problem, which caused him to be unable to read the book online. There are several possible reasons for a network connection problem: 1. The network was unstable. The internet connection was sometimes good and sometimes bad, which could cause problems when reading online. 2. Server failure. The server where the online reading was located might malfunction and cause the user to be unable to read the book. 3. Browser issues. The browser might malfunction, resulting in the inability to read online. In order to solve this problem, you can try the following methods: 1 Wait for a few minutes. Sometimes, the network connection problem would resolve itself by waiting for a few minutes before trying again. 2. Change the browser. He tried to read the book online using another browser to see if it worked. 3. Contact customer service. If the above methods can't solve the problem, you can try to contact the customer service of online reading for help. I hope the above method can solve your problem.