Error:Access to the dex task is now impossible, starting with 1.4.0

When trying to add Newrelic to an Android app, the following error occured:

 

Error:Access to the dex task is now impossible, starting with 1.4.0
1.4.0 introduces a new Transform API allowing manipulation of the .class files.
See more information: http://tools.android.com/tech-docs/new-build-system/transform-api

On Stackoverflow, people were given advice, such as changing the gradle version:

However, this does not seem to be the right solution.