現在monacaでプッシュ通知に関するテストアプリを作成しています。  
ビルドして動作を確かめようとしたところ、  
添付画像のようなエラー画面が出現し、ビルドが失敗してしまいます。  
[![ビルド失敗](https://i.stack.imgur.com/RdSM6.png)](https://i.stack.imgur.com/RdSM6.png)  
backendとの接続を切ったところビルドに成功したためbackendに原因があるようですが、解決方法がわかりません。

どなたか原因が分かる方はいますでしょうか。

追記: ビルド時のメッセージを追記しています。 ※IDは置換しています

> Temporary folder: /private/tmp/monaca/******************  
>  Downloading project  
>  Download complete  
>  Running for 4.1  
>  Installing "mobi.monaca.plugins.Monaca" for android  
>  cordova version not detected (lacks script
> "/private/tmp/monaca/******************/android/skeleton/platforms/android/cordova/version"
> ), continuing.  
>  Installing "org.apache.cordova.splashscreen" for android  
>  Installing "plugin.push.nifty" for android  
>  cordova version not detected (lacks script
> "/private/tmp/monaca/******************/android/skeleton/platforms/android/cordova/version"
> ), continuing.  
>  Installing "org.apache.cordova.dialogs" for android  
>  Installing "mobi.monaca.plugins.MonacaBackend" for android  
>  cordova version not detected (lacks script
> "/private/tmp/monaca/******************/android/skeleton/platforms/android/cordova/version"
> ), continuing.  
>  Updated local.properties  
>  No project name specified, using project folder name 'google-play-
> services_lib'.  
>  If you wish to change it, edit the first line of build.xml.  
>  Added file
> /private/tmp/monaca/******************/android/skeleton/platforms/android/mobi.monaca.plugins.MonacaBackend/google-
> play-services_lib/build.xml  
>  Added file
> /private/tmp/monaca/******************/android/skeleton/platforms/android/mobi.monaca.plugins.MonacaBackend/google-
> play-services_lib/proguard-project.txt  
>  Running command:
> /private/tmp/monaca/******************/android/skeleton/hooks/after_prepare/monaca_enterprise_encrypt.js
> /private/tmp/monaca/******************/android/skeleton  
>  Running command:
> /private/tmp/monaca/******************/android/skeleton/platforms/android/cordova/build
> --debug  
>  Buildfile:
> /private/tmp/monaca/******************/android/skeleton/platforms/android/build.xml  
>  -set-mode-check:  
>  -set-debug-files:  
>  -check-env:  
>  [checkenv] Android SDK Tools Revision 23.0.2  
>  [checkenv] Installed at /Applications/adt-bundle-mac/sdk  
>  -setup:  
>  [echo] Project Name: MainActivity  
>  [gettype] Project Type: Application  
>  -set-debug-mode:  
>  -debug-obfuscation-check:  
>  -pre-build:  
>  -build-setup:  
>  [getbuildtools] Using latest Build Tools: 20.0.0  
>  [echo] Resolving Build Target for MainActivity...  
>  [gettarget] Project Target: Android 4.4.2  
>  [gettarget] API level: 19  
>  [echo] ----------  
>  [echo] Creating output directories if needed...  
>  [mkdir] Created dir:
> /private/tmp/monaca/******************/android/skeleton/platforms/android/ant-
> build  
>  [mkdir] Created dir:
> /private/tmp/monaca/******************/android/skeleton/platforms/android/ant-
> build/res  
>  [mkdir] Created dir:
> /private/tmp/monaca/******************/android/skeleton/platforms/android/ant-
> build/rsObj  
>  [mkdir] Created dir:
> /private/tmp/monaca/******************/android/skeleton/platforms/android/ant-
> build/rsLibs  
>  [mkdir] Created dir:
> /private/tmp/monaca/******************/android/skeleton/platforms/android/ant-
> gen  
>  [mkdir] Created dir:
> /private/tmp/monaca/******************/android/skeleton/platforms/android/ant-
> build/classes  
>  [mkdir] Created dir:
> /private/tmp/monaca/******************/android/skeleton/platforms/android/ant-
> build/dexedLibs  
>  [echo] ----------  
>  [echo] Resolving Dependencies for MainActivity...  
>  [dependency] Library dependencies:  
>  [dependency]  
>  [dependency] ------------------  
>  [dependency] Ordered libraries:  
>  [dependency]  
>  [dependency] ------------------  
>  [dependency] Found 2 versions of google-play-services.jar in the dependency
> list,  
>  [dependency] but not all the versions are identical (check is based on
> SHA-1 only at this time).  
>  [dependency] All versions of the libraries must be the same at this time.  
>  [dependency] Versions found are:  
>  [dependency] Path:
> /private/tmp/monaca/******************/android/skeleton/platforms/android/mobi.monaca.plugins.MonacaBackend/google-
> play-services_lib/libs/google-play-services.jar  
>  [dependency] Length: 2264484  
>  [dependency] SHA-1: 3dfdf1db5ce5ea2999a5dcde8c8e650b02660059  
>  [dependency] Path:
> /private/tmp/monaca/******************/android/skeleton/platforms/android/libs/google-
> play-services.jar  
>  [dependency] Length: 1881748  
>  [dependency] SHA-1: 7676c0cb230efa6ac41c47867d372ed5913029d4  
>  BUILD FAILED  
>  /Applications/adt-bundle-mac/sdk/tools/ant/build.xml:577: Jar mismatch! Fix
> your dependencies  
>  Total time: 1 second  
>
> /private/tmp/monaca/******************/android/skeleton/platforms/android/cordova/node_modules/q/q.js:126  
>  throw e;  
>  ^  
>  Error code 1 for command: ant with args:
> debug,-f,/private/tmp/monaca/******************/android/skeleton/platforms/android/build.xml,-Dout.dir=ant-
> build,-Dgen.absolute.dir=ant-gen  
>  Error:
> /private/tmp/monaca/******************/android/skeleton/platforms/android/cordova/build:
> Command failed with exit code 8  
>  at ChildProcess.whenDone
> (/data/monaca_build_module/4.1/node_modules/cordova/node_modules/cordova-
> lib/src/cordova/superspawn.js:135:23)  
>  at ChildProcess.emit (events.js:98:17)  
>  at maybeClose (child_process.js:755:16)  
>  at Process.ChildProcess._handle.onexit (child_process.js:822:5)  
>  Build error: Error building project source code
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2015-08-27T05:22:02.140
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2015-08-27T08:49:54.223
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question
monaca build
monacaでbackendを設定したときだけビルドがうまくいきません