Android Build Error

Help needed to fix this error.

FAILURE: Build failed with an exception.
UnityEngine.GUIUtilityrocessEvent(Int32, IntPtr)

CommandInvokationFailure: Gradle build failed.
G:/Program Files/Unity/2019.2.0f1/Editor/Data/PlaybackEngines/AndroidPlayer/Tools\OpenJDK\Windows\bin\java.exe -classpath "G:\Program Files\Unity\2019.2.0f1\Editor\Data\PlaybackEngines\AndroidPlayer\Tools\gradle\lib\gradle-launcher-5.1.1.jar" org.gradle.launcher.GradleMain "-Dorg.gradle.jvmargs=-Xmx4096m" "assembleRelease"
stderr[
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':checkReleaseDuplicateClasses'.
> 1 exception was raised by workers:
java.lang.RuntimeException: Duplicate class com.google.zxing.BarcodeFormat found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.Binarizer found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.BinaryBitmap found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.ChecksumException found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.DecodeHintType found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.EncodeHintType found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.FormatException found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.LuminanceSource found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.MultiFormatReader found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.MultiFormatWriter found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.MultiFormatWriter$1 found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.NotFoundException found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.PlanarYUVLuminanceSource found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.RGBLuminanceSource found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.Reader found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.ReaderException found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.Result found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.ResultMetadataType found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.ResultPoint found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.ResultPointCallback found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.Writer found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.WriterException found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.aztec.AztecDetectorResult found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.aztec.AztecReader found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.aztec.decoder.Decoder found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.aztec.decoder.Decoder$1 found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.aztec.decoder.Decoder$Table found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.aztec.detector.Detector found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.aztec.detector.Detector$Point found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.client.result.AbstractDoCoMoResultParser found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.client.result.AddressBookAUResultParser found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.client.result.AddressBookDoCoMoResultParser found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.client.result.AddressBookParsedResult found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.client.result.BizcardResultParser found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.client.result.BookmarkDoCoMoResultParser found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.client.result.CalendarParsedResult found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.client.result.EmailAddressParsedResult found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.client.result.EmailAddressResultParser found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.client.result.EmailDoCoMoResultParser found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.client.result.ExpandedProductParsedResult found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.client.result.ExpandedProductResultParser found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.client.result.GeoParsedResult found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.client.result.GeoResultParser found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.client.result.ISBNParsedResult found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.client.result.ISBNResultParser found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.client.result.ParsedResult found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.client.result.ParsedResultType found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.client.result.ProductParsedResult found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.client.result.ProductResultParser found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.client.result.ResultParser found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.client.result.SMSMMSResultParser found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.client.result.SMSParsedResult found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.client.result.SMSTOMMSTOResultParser found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.client.result.SMTPResultParser found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.client.result.TelParsedResult found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.client.result.TelResultParser found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.client.result.TextParsedResult found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.client.result.URIParsedResult found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.client.result.URIResultParser found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.client.result.URLTOResultParser found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.client.result.VCardResultParser found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.client.result.VEventResultParser found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.client.result.WifiParsedResult found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.client.result.WifiResultParser found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.common.BitArray found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.common.BitMatrix found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.common.BitSource found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.common.CharacterSetECI found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.common.DecoderResult found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.common.DefaultGridSampler found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.common.DetectorResult found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.common.GlobalHistogramBinarizer found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.common.GridSampler found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.common.HybridBinarizer found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.common.PerspectiveTransform found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.common.StringUtils found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.common.detector.MathUtils found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.common.detector.MonochromeRectangleDetector found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.common.detector.WhiteRectangleDetector found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.common.reedsolomon.GenericGF found in modules MIO_SDK_UNITY_1.3.9_10156.jar UnityChannel and com.google.zxing.core-3.3.3.jar (com.google.zxing.core-3.3.3.jar)
Duplicate class com.google.zxing.common.reedsolomon.GenericGFPoly found in modules MIO_SDK_UNITY_1.3.9_10156.<message truncated>

 

As quoted above, you have duplicate class file. Try to remove the libraries which is causing duplicates.

 

I have imported Facebook, Firebase and Googleplay services and UnityAd packages. With build works fine. Then I imported Unity inApp Puchase library. That caused problems. Unity is not allowing to delete that inApp purcahse library. delete is disabled. I don't know what to do.

 

This can be due to UnityChannel. Not sure for what's it is being used.
Once share a screenshot of Assets/Plugins/Android folder.

 

I have the same issue and it drives me mad. The Unity Cloud Build also fails to compile. Seems like Unity's iAps are not compatible with Firebase's official SDK.