hi guys i get this error when i try to run my app Error:Execution failed for task ‘:app:transformDexArchiveWithExternalLibsDexMergerForDebug’. com.android.builder.dexing.DexArchiveMergerException: Unable to merge dex i don’t know why! I tried also to clean and rebuild project but i get always the same error! Now i post my gradle: Answer I could compile your gradle after this changes: instead of and also
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