You may try the following steps: (1) Check your mobile phone to see if the access permission of “microphone” is turned on. If not, enable the recording function of “Aha Chinese” in the permission management section of “Settings” or “Security Software” on your mobile phone; (2) Check your mobile phone to see if it is connected to the Internet, and if the network is working properly; (3) If the problem persists, you can try to clear the cache on your mobile phone. The path is “Me” – “Settings” – “Clear Cache” – “Clear the Cache of All Courses.” After that, add your courses again.