Question [Q] Install_failed_invalid_install_location

hi i post here because of the 10 posts limit in android dev.section..

i flashed JellyVanilla EX 6.1 on my xperia arc lt15i with his recommended darkkernel for 10.1cm, everything i need is working but some apps can not be installed from sd card and says "app not installed" or via flashtool and it says "INSTALL_FAILED_INVALID_INSTALL_LOCATION"

i followed his advice and used zipsigner for titanium backup version and signed the apk but results is the same..i changed root access to apps and ADB together in developer options and still have the same result.???

pls help..i love this rom which is extraordinary fast and beautiful