AWS-Device farm Uses TestNG Framework Regardless of selecting Appium Java Junit for Testing

I'm working with AWS-Device Farm and I followed the steps specified to run my test package, I have selected Test Configuration Appium Java Junit But All of my test cases failed. So After looking at popup messages displayed along with error messages I notice that AWS Runs My test cases by converting my junit test cases to TestNG. How to overcome this issue please suggest some solution.