android {
You can ignore those files in your build.gradle:
	}
	  packagingOptions {
Error:Execution failed for task ':app:packageDebug'.
> Duplicate files copied in APK META-INF/LICENSE
  	File 1: /Users/Steven/.gradle/caches/modules-2/files-2.1/com.fasterxml.jackson.core/jackson-databind/2.2.2/3c8f6018eaa72d43b261181e801e6f8676c16ef6/jackson-databind-2.2.2.jar
  	File 2: /Users/Steven/.gradle/caches/modules-2/files-2.1/com.fasterxml.jackson.core/jackson-annotations/2.2.2/285cb9c666f0f0f3dd8a1be04e1f457eb7b15113/jackson-annotations-2.2.2.jar
	  }
Error:duplicate files during packaging of APK /Users/Steven/AndroidStudioProjects/Sparks/app/build/outputs/apk/app-debug-unaligned.apk
	    exclude 'META-INF/LICENSE'
	Origin 1: /Users/Steven/.gradle/caches/modules-2/files-2.1/com.fasterxml.jackson.core/jackson-databind/2.2.2/3c8f6018eaa72d43b261181e801e6f8676c16ef6/jackson-databind-2.2.2.jar
	Origin 2: /Users/Steven/.gradle/caches/modules-2/files-2.1/com.fasterxml.jackson.core/jackson-annotations/2.2.2/285cb9c666f0f0f3dd8a1be04e1f457eb7b15113/jackson-annotations-2.2.2.jar
	Path in archive: META-INF/LICENSE