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
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