[Q] I'm not able to Install some Apps from playstore

view full story

http://forum.xda-developers.com – I'm on Crash jellybeam rom , and i when ever i download apps like aldiko bookreader , ski safari , m not able to install it from playstore, the file downloads but then it says 'could not install on sdcard or internal' (something like that). i even tried titanium backup pro and all apps get restored except these and i tried installing this apps through apk files and it says application not installed! What is the problem ? (HowTos)