Execution failed for task ':app:processDebugResources' even with latest build tools

Issue SOLVED by making library and app build.gradle same ... compileSdkVersion and buildToolsVersion.

library build.gradle and

android {

    compileSdkVersion 25
    buildToolsVersion "25.0.0"
    .....
    .....
}

app build.gradle

android {

    compileSdkVersion 25
    buildToolsVersion "25.0.0"
    .....
    .....
}

Set your compileSdkVersion to 23 in your module's build.gradle file.

Error:Execution failed for task com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException:

finished with non-zero exit value 1

One reason for this error to occure is that the file path to a resource file is to long:

Error: File path too long on Windows, keep below 240 characters 

Fix: Move your project folder closer to the root of your disk

Don't:// folder/folder/folder/folder/very_long_folder_name/MyProject...

Do://folder/short_name/MyProject

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Another reason could be duplicated resources or name spaces

Example:

  <style name="MyButton" parent="android:Widget.Button">
      <item name="android:textColor">@color/accent_color</item>
      <item name="android:textColor">#000000</item>
  </style>

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And make sure all file names and extensions are in lowercase

Wrong

myimage.PNG
myImage.png

Correct

my_image.png

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Make sure to Clean/Rebuild project

(delete the 'build' folder)