Androidアプリ Gradle エラー

lang
1Error:Execution failed for task ':app:dexDebug'.
2> com.android.ide.common.internal.LoggedErrorException: Failed to run command:
3	C:\Users\hirogon3113\AppData\Local\Android\sdk\build-tools\21.1.2\dx.bat --dex --no-optimize --output C:\Users\hirogon3113\AndroidStudioProjects\WadaTwi\app\build\intermediates\dex\debug --input-list=C:\Users\hirogon3113\AndroidStudioProjects\WadaTwi\app\build\intermediates\tmp\dex\debug\inputList.txt
4Error Code:
5	2
6Output:
7	UNEXPECTED TOP-LEVEL EXCEPTION:
8	com.android.dex.DexException: Multiple dex files define Lcom/google/android/gms/actions/ReserveIntents;
9		at com.android.dx.merge.DexMerger.readSortableTypes(DexMerger.java:596)
10		at com.android.dx.merge.DexMerger.getSortedTypes(DexMerger.java:554)
11		at com.android.dx.merge.DexMerger.mergeClassDefs(DexMerger.java:535)
12		at com.android.dx.merge.DexMerger.mergeDexes(DexMerger.java:171)
13		at com.android.dx.merge.DexMerger.merge(DexMerger.java:189)
14		at com.android.dx.command.dexer.Main.mergeLibraryDexBuffers(Main.java:454)
15		at com.android.dx.command.dexer.Main.runMonoDex(Main.java:303)
16		at com.android.dx.command.dexer.Main.run(Main.java:246)
17		at com.android.dx.command.dexer.Main.main(Main.java:215)
18		at com.android.dx.command.Main.main(Main.java:106)