Fire App Builder will not Finish Install

I have followed all the the directions at https://developer.amazon.com/docs/fire-app-builder/download-and-build.html and run all of the updates when prompted. I have "cleaned" and "rebuilt" the project numerous times but still no dice. Any feedback is appreciated.

Here's the error:

Caused by: groovy.lang.GroovyRuntimeException: Cannot set the value of read-only property 'outputFile' for ApkVariantOutputImpl_Decorated{apkData=Main{type=MAIN, fullName=debug, filters=[], versionCode=10, versionName=1.0.7}} of type com.android.build.gradle.internal.api.ApkVariantOutputImpl.

More Details:

FAILURE: Build failed with an exception.

* Where:
Script 'E:\Git\fire-app-builder\Application\artifacts.gradle' line: 19

* What went wrong:
A problem occurred configuring project ':app'.
> groovy.lang.GroovyRuntimeException: Cannot set the value of read-only property 'outputFile' for ApkVariantOutputImpl_Decorated{apkData=Main{type=MAIN, fullName=debug, filters=[], versionCode=10, versionName=1.0.7}} of type com.android.build.gradle.internal.api.ApkVariantOutputImpl.

Start with the installation instructions and inspect Application/artifacts.gradle at line 19, where the reported configuration failure occurs. Reproduce the build failure and determine what change is needed for the read-only outputFile error to disappear; done means the project completes installation successfully.

Written by the indexing model from the issue text.