How to show compilation errors in android studio -

I am very worried about how to show the compilation errors in Android studio, I already spent an hour is. I tried one of the following:

but showing another error:

  javac: invalid target release: 1.8  < / Pre> 
 Please know which real solution please answer please.   
 
 
 There is a 'problem' view in the project window:  
  
 Just click on the drop down (Android settings are the default) and select 'Problems.' Eclipse does not seem to be comparable with problems ...