I've been trying to install a couple apps on my tablet but the error "App didn't install" pops up about one second after i press install.All the apps i tried i had no trouble installing on my phone.
You'll get that error if an older version of the app is still installed. (Which can happen if you move an app to the SD card, then remove the SD card.) I'm not saying that's the cause of your problem, but that situation (the app still being installed) will cause the error.
I want to add that I'm the one who asked the question and i found out that simply cannot install any all on my tablet.I tried to download a random apps from play store,create a copy,delete the original and when I try to install the copy it says ''App didn't install'' again.