Every time I try to test clicking the play arrow while emulator is on, it throws an error at me and it won't launch my app.
Edit: I'm only on Part 4 of thenewbostons android development tutorial, so I have no idea how to fix it myself


Executing tasks: [:app:generateDebugSources, :app:generateDebugAndroidTestSources, :app:assembleDebug]

Configuration on demand is an incubating feature.
:app:preBuild UP-TO-DATE
:app:preDebugBuild UP-TO-DATE
:app:checkDebugManifest
:app:preReleaseBuild UP-TO-DATE
:app:prepareComAndroidSupportAppcompatV72311Library UP-TO-DATE
:app:prepareComAndroidSupportDesign2311Library UP-TO-DATE
:app:prepareComAndroidSupportRecyclerviewV72311Library UP-TO-DATE
:app:prepareComAndroidSupportSupportV42311Library UP-TO-DATE
:app:prepareDebugDependencies
:app:compileDebugAidl UP-TO-DATE
:app:compileDebugRenderscript UP-TO-DATE
:app:generateDebugBuildConfig UP-TO-DATE
:app:generateDebugAssets UP-TO-DATE
:app:mergeDebugAssets UP-TO-DATE
:app:generateDebugResValues UP-TO-DATE
:app:generateDebugResources UP-TO-DATE
:app:mergeDebugResources UP-TO-DATE
:app:processDebugManifest UP-TO-DATE
:app:processDebugResources UP-TO-DATE
:app:generateDebugSources UP-TO-DATE
:app:preDebugAndroidTestBuild UP-TO-DATE
:app:prepareDebugAndroidTestDependencies
:app:compileDebugAndroidTestAidl UP-TO-DATE
:app:processDebugAndroidTestManifest UP-TO-DATE
:app:compileDebugAndroidTestRenderscript UP-TO-DATE
:app:generateDebugAndroidTestBuildConfig UP-TO-DATE
:app:generateDebugAndroidTestAssets UP-TO-DATE
:app:mergeDebugAndroidTestAssets UP-TO-DATE
:app:generateDebugAndroidTestResValues UP-TO-DATE
:app:generateDebugAndroidTestResources UP-TO-DATE
:app:mergeDebugAndroidTestResources UP-TO-DATE
:app:processDebugAndroidTestResources UP-TO-DATE
:app:generateDebugAndroidTestSources UP-TO-DATE
:app:processDebugJavaRes UP-TO-DATE
:app:compileDebugJavaWithJavac UP-TO-DATE
:app:compileDebugNdk UP-TO-DATE
:app:compileDebugSources UP-TO-DATE
:app:preDexDebug UP-TO-DATE
:app:dexDebug
AGPBI: {"kind":"simple","text":"UNEXPECTED TOP-LEVEL EXCEPTION:","sources":[{}]}
AGPBI: {"kind":"simple","text":"com.android.dex.DexException: Multiple dex files define Landroid/support/design/widget/AppBarLayout;","sources":[{}]}
AGPBI: {"kind":"simple","text":"\tat com.android.dx.merge.DexMerger.readSortableTypes(DexMerger.java:579)","sources":[{}]}
AGPBI: {"kind":"simple","text":"\tat com.android.dx.merge.DexMerger.getSortedTypes(DexMerger.java:535)","sources":[{}]}
AGPBI: {"kind":"simple","text":"\tat com.android.dx.merge.DexMerger.mergeClassDefs(DexMerger.java:517)","sources":[{}]}
AGPBI: {"kind":"simple","text":"\tat com.android.dx.merge.DexMerger.mergeDexes(DexMerger.java:164)","sources":[{}]}
AGPBI: {"kind":"simple","text":"\tat com.android.dx.merge.DexMerger.merge(DexMerger.java:188)","sources":[{}]}
AGPBI: {"kind":"simple","text":"\tat com.android.dx.command.dexer.Main.mergeLibraryDexBuffers(Main.java:504)","sources":[{}]}
AGPBI: {"kind":"simple","text":"\tat com.android.dx.command.dexer.Main.runMonoDex(Main.java:334)","sources":[{}]}
AGPBI: {"kind":"simple","text":"\tat com.android.dx.command.dexer.Main.run(Main.java:277)","sources":[{}]}
AGPBI: {"kind":"simple","text":"\tat com.android.dx.command.dexer.Main.main(Main.java:245)","sources":[{}]}
AGPBI: {"kind":"simple","text":"\tat com.android.dx.command.Main.main(Main.java:106)","sources":[{}]}


 FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:dexDebug'. < Error is here
> com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException: Process 'command 'C:\Program Files\Java\jdk1.8.0_65\bin\java.exe'' finished with non-zero exit value 2

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED

Total time: 4.502 secs


I have no idea how to fix this, tried Google but couldn't find any good help. I'm new to android development.
Also, there's another error that I'm getting when rendering the phone in the middle of the screen, and there's no phone there. (Couldn't get the error message back up, will soon) Help on any of these would be greatly appreciated