Try to clear cache on the settings, some Android phone has a limit. Mine is 200mb after that, I can't update any applications, take photos or record a video. Do you have a memory card? Maybe you can change the storage setting from phone memory to sd. I hope it will work.

 

Yeah, Android needs to keep some space free as working storage, and if installing an app would take you below that it won't install. The limit is set by the manufacturer, so may well be higher than technology talk's - 500MB is not uncommon. If that's the cause then freeing some internal space is the only solution.

 

Dude, just get rid of 8 MB somehow, it should work...

 

May not be 8MB that's needed. For one thing, the Play Store tends to show the download size, while the installed size of an app is larger. For another, the limit is for installing apps; when you are below it you can still download files, your installed apps can still save data, etc, so you may need to clear a lot more than just the size of the app before you get back above the limit. That's why the suggestion above of clearing caches is the simplest quick fix, since these can be many 10s or even hundreds of MB in size. But cache clearing is only a short-term fix as these will fill again.