What’s your Application Icon? Too large/small? What’s the file extension?
Your Application icon is too large. Decrease it’s size and you’ll be ready to compile your app. There are image resizers on the internet that you can use to decrease the size of your icon.
Just a tip: Don’t use Makeroid Builder on your mobile device as it’s not optimized to work on your device. Use it on your computer instead.
Or even Shift Transform on Photoshop