I am currently in the process of converting one of our projects to Gradle from maven. The folder structure is as follows:

gitRoot
    settings.gradle
    build.gradle
    ProjectA
        build.gradle
        src/main/java
    Libraries
        SomeLib (git submodule)
        ProjectBRoot (git submodule)
            settings.gradle
            build.gradle
            ProjectB
                build.gradle
                src/main/java
            Libraries
                FacebookSDK/facebook
                    build.gradle
                    src

So already it looks complicated. But the idea is that ProjectB is a library project and it should be able to be built and packaged separately, which is why it has its own settings.gradle and as far as i can tell it seems to be working ok, i have it building and its finding facebook just fine.

The ProjectB/build.gradle contains this line

compile project(':libraries:facebook-android-sdk:facebook')

The ProjectBRoot/settings.gradle contains this line

include ':ProjectB', ':libraries:facebook-android-sdk:facebook'

The gitRoot/settings.gradle contains this line

include ':ProjectA', ':Libraries:ProjectBRoot:ProjectB'

The ProjectA/build.gradle contains this line

compile project(':Libraries:ProjectBRoot:ProjectB')

When I run the build i get this error

The TaskContainer.add() method has been deprecated and is scheduled to be removed in Gradle 2.0. Please use the create() method instead.

FAILURE: Build failed with an exception.

* Where:
Build file '/gitRoot/Libraries/ProjectBRoot/ProjectB/build.gradle' line: 17

* What went wrong:
A problem occurred evaluating project ':Libraries:ProjectBRoot:ProjectB'.
> Project with path ':libraries:facebook-android-sdk:facebook' could not be found in project ':Libraries:ProjectBRoot:ProjectB'.

* T
android gradle facebook-android-sdk
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