Eu tenho um projeto Ionic 3, quando executo "cordova iônico, execute android --prod" que vejo

Esse erro:

ANDROID_HOME=C:\Users\asus\AppData\Local\Android\sdk\ 
JAVA_HOME=C:\Program Files\Java\jdk1.8.0_131\  
Subproject Path: CordovaLib null 
The Task.leftShift(Closure) method has been deprecated and 
is scheduled to be removed in Gradle 5.0. Please use 
Task.doLast(Action) instead.
        at build_86b8k75dm7qqz7n5jyg9xp8kh.run(D:\project\ionic\MyProject\platforms\android\build.gradle:138) org.xwalk:xwalk_core_library:23+ The JavaCompile.setDependencyCacheDir() method has been deprecated and is scheduled to be removed in Gradle 4.0.

Incremental java compilation is an incubating feature. The TaskInputs.source(Object) method has been deprecated and is scheduled to be removed in Gradle 4.0. Please use TaskInp uts.file(Object).skipWhenEmpty() instead.

FAILURE: Build failed with an exception.

* What went wrong:

BUILD FAILED

Total time: 15.644 secs A problem occurred configuring root project 'android'.
> Could not resolve all dependencies for configuration ':_armv7DebugApkCopy'.
   > Could not resolve org.xwalk:xwalk_core_library:23+.
     Required by:
         project :
      > Could not resolve org.xwalk:xwalk_core_library:23+.
         > Failed to list versions for org.xwalk:xwalk_core_library.
            > Unable to load Maven meta-data from https://download.01.org/crosswalk/releases/crosswalk/android/maven2/org /xwalk/xwalk_core_library/maven-metadata.xml.
               > Could not GET 'https://download.01.org/crosswalk/releases/crosswalk/android/maven2/org/xwalk/xwalk_core_ library/maven-metadata.xml'. Received status code 503 from server: Service Unavailable

* Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Error: cmd: Command failed with exit code 1 Error output: FAILURE: Build failed with an exception.

* What went wrong: A problem occurred configuring root project 'android'.
> Could not resolve all dependencies for configuration ':_armv7DebugApkCopy'.
   > Could not resolve org.xwalk:xwalk_core_library:23+.
     Required by:
         project :
      > Could not resolve org.xwalk:xwalk_core_library:23+.
         > Failed to list versions for org.xwalk:xwalk_core_library.
            > Unable to load Maven meta-data from https://download.01.org/crosswalk/releases/crosswalk/android/maven2/org /xwalk/xwalk_core_library/maven-metadata.xml.
               > Could not GET 'https://download.01.org/crosswalk/releases/crosswalk/android/maven2/org/xwalk/xwalk_core_ library/maven-metadata.xml'. Received status code 503 from server: Service Unavailable

* Try: Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.


[ERROR] Cordova encountered an error.
        You may get more insight by running the Cordova command above directly.

[ERROR] An error occurred while running cordova run android (exit code 1).

Não recebi esse erro antes de executar o Ionic.