Android deployment in Unity

I am learning VR in Unity and was trying android deployment for the app. The app works well in in PC and Linux platform but it gives a "Build Failure" when Android platform is chosen. After studying from unity answers and stack over flow I tried all the options like : Downgrading SDK Updating JDK ANDROID or UNITY Removing and Renaming tools folder in sdk taking care of the android path in external tools and many more but nothing worked.

I am attaching a screenshot showing the current status. I want to run my app on android phone Please help me with same.

Thanks