The 360 browser novel chapter file on the phone is missing. Please check if the SD card is installed. This situation is usually caused by incompatible files or file system errors in the SD card. It is recommended to first check whether the SD card is installed correctly and ensure that the file system supports reading and writing. If the SD card is installed correctly and the file system supports reading and writing, you can try to insert the card into another phone to test if it is the problem with the card itself. If other phones can also be used normally, then there may be incompatible files or file system errors in the SD card. You need to format the SD card or replace it with another one.