I want to make android app. I have installed androis studio and now i have problem with it. The preview window is hidden 

I have tried to fix this problem by updating everything that is possible, but after updating the window is not shown

[Image of android studio](https://i.stack.imgur.com/mmlnG.png)

You can see that i dont see screen where is running code

Android studio does not show me errors and
API is 22