A problem occurred configuring root project 'android'. > Could not resolve all dependencies for configuration ':_armv7DebugCompile'. > Could not resolve org.xwalk:xwalk_core_library:18+.

Error:A problem occurred configuring root project 'android'. > Could not resolve all dependencies for configuration ':_armv7DebugCompile'. > Could not find any version that matches org.xwalk:xwalk_core_library_beta:18+. Versions that do not match: 20.50.533.2 Searched in the following locations: file:/D:/Android/Android Studio/gradle/m2repository/org/xwalk/xwalk_core_library_beta/maven-metadata.xml file:/D:/Android/Android Studio/gradle/m2repository/org/xwalk/xwalk_core_library_beta/ https://repo1.maven.org/maven2/org/xwalk/xwalk_core_library_beta/maven-metadata.xml https://repo1.maven.org/maven2/org/xwalk/xwalk_core_library_beta/ https://download.01.org/crosswalk/releases/crosswalk/android/maven2/org/xwalk/xwalk_core_library_beta/maven-metadata.xmlError:A