ClassNotFoundException on sbt-android-plugin

I tried to create a brand-new scala project for android, but I found it cannot be started by ClassNotFoundException which means MainActivity was not found. Again, it is caused by Proguard and it seems skeleton program created by 
g8 jberkel/android-app
uses proguard by default. To cut proguard, you just comment out 
"proguardSetting ++"
line in project/Build.scala file. Setting "false" to proguardSettings seems not working, so just comment it out.

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