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org.gradle.api.internal.tasks.DefaultTaskInputs$TaskInputUnionFileCollection cannot be cast to org.gradle.api.internal.file.collections. 


Error:Cause: org.gradle.api.internal.tasks.DefaultTaskInputs$TaskInputUnionFileCollection cannot be cast to org.gradle.api.internal.file.collections.DefaultConfigurableFileCollection Possible causes for this unexpected error include:
    

  • Gradle's dependency cache may be corrupt (this sometimes occurs after a network connection timeout.) Re-download dependencies and sync project (requires network)
    • 



    

  • The state of a Gradle build process (daemon) may be corrupt. Stopping all Gradle daemons may solve this problem. Stop Gradle build processes (requires restart)
    • 



    

  • Your project may be using a third-party plugin which is not compatible with the other plugins in the project or the version of Gradle requested by the project.
    • 


In the case of corrupt Gradle processes, you can also try closing the IDE and then killing all Java processes.





Solutions:





Upgrade your gradle build tools to the latest version.



One easy way to do this is to add the latest version of the build tools as a dependency in your build.gradle file, for example:


dependencies {
    classpath 'com.android.tools.build:gradle:2.2.0-beta1'
}



You can then run gradle tasks and gradle will download everything you need.



After Android Studio 2.2 stable released on Sep 19 2016 , the latest version of the build tools is 2.2.0 . So you can fix it by :


dependencies {
    classpath 'com.android.tools.build:gradle:2.2.0'
}



As Android Studio 2.4 stable is not ready to release yet (May 4 2017), the latest stable version of build tools is 2.3.1 .


dependencies {
    classpath 'com.android.tools.build:gradle:2.3.1'
}



If you update this build tools version to 2.3.* , you should also update gradle wrapper version to 3.3 in /yourProjectRoot/gradle/wrapper/gradle-wrapper.properties file. (i know it is not matching question Gradle build failing after update to 3.0, but i strongly suggest you to use latest build tool as google recommended)



BTW: version 2.3.1 of build tool is only exist on jCenter, not MavenCentral, so if you run into error below when run gradlew command line in terminal


Could not find com.android.tools.build:gradle:2.3.1.
 Searched in the following locations:
     https://repo1.maven.org/maven2/com/android/tools/build/gradle/2.3.1/gradle-2.3.1.pom
     https://repo1.maven.org/maven2/com/android/tools/build/gradle/2.3.1/gradle-2.3.1.jar



just replace mavenCentral() with jcenter() like


 repositories {
    jcenter()
    //mavenCentral()
}

Comments

  1. Unknown27 May 2018 at 22:34

    After hours of hours I found this unique solution, thanks.
    Somebody (not me) called android studio as ASS - android stupid studio.

    ReplyDelete

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