installing and testing my ionic android app on android x86 and virtualbox

I have set my virtual device and connected to the internet successfully! I also connected it to sdk my running the command adb connect <my_device_ip> After launching my app using ionic run it connects to my android virtual device successfully! after the line installing app on device... it throws an error ERROR: Failed to launch application on device: ERROR: Failed to install apk to device: pkg:/data/local/tmp/cordovaApp-debug.apk Failure [INSTALL_FAILED_OLDER_SDK] rm failed -f, Read-only file system ERROR running one or more of the platforms:... Please help. Thanks.