The size of the APK file you are trying to install exceeds the available memory of the device. "apk memory is less than 4g" means that the size of the APK file you are trying to install exceeds the available memory of the device. APK is the installation package file of Android application. This error occurs when the application is too large and the device is out of memory. You can open device settings, find storage or memory options, and view and clean up unnecessary files, pictures, videos, etc.