I have recently updated my `Android Studio` to 2.1.1 and initially, the layout previews weren't working. There was a rendering problem. Then I changed the version of the `Android` to 23 (as was the solution to this problem i found in here). By this, thankfully rendering problem was solved.

But then another problem occurred in execution, and I found that .apk file is not generated.
And it gave **FileNotFoundException** for app-debug-unaligned.apk

I even tried to build apk manually but it also didn't work.
It says "File `<MyProjectPath>\app\build\outputs\apk\app-debug-unaligned.apk`can not be found". 
apk folder is generated but its empty.
Please help !