1. Book copyright: Some books need to be purchased separately or can only be read in certain areas, so the free experience card cannot read these books.
2. System problem: You can't read normally because there is something wrong with your equipment or network. You can try reloading the page or changing the device to read the page.
3. Reading settings: You can check your reading settings in the "Settings" of WeChat reading to ensure that your device is connected to the Internet and allow WeChat reading to use network connection.