Скачать или смотреть Restart Caches is the solution - Android studio

how to clear cache?
A “cache” is a temporary place where developers store data of a particular website or App. When you will access that specific website or app again the data from the cache files are used to load the pages instead of downloading it again – because going to the network is slow and expensive. The main purpose of caches is to improve things like browsing experience by boosting the page loading speed.
Android Studio makes a lot of files as caches and does not delete them. This can cause trouble when there is a need to make new files, so clearing 'caches will clear the old cache` and make it fast.
+That's help in
Updating problems.
Working with android studio along with Eclipse
Error Installing APK
It's easy solution for many problem.