ERROR : Failed to install app

I wanted to create an app and later publish it in WD store. I was just going through this example app. However when I try to install this app from wd app store (web interface) manualy, I immediately get the error as “Failed to install app”.

I use that as example :

What can be wrong and is there any logs where i can figure out what is the problem ?

I find out the problem, it was that i make package in folder /src, while my Package name in apkg.rc is “MyTest”. So folder where you are going to build, should have the same name as Package name declared in apkg.rc