Hello Yapraka,
We recommend that you install JDK7 and set the path for java_home as JDK 7 to use the aar.
For the source build, I cannot find any reference to projectinternal or getPluginManager in our SDK. Looking up projectinternal leads me to [projectinternal.java][1] which is part of the gradle master.
What version of gradle are you using?
The version should be included in your project’s top level build.gradle dependencies.
e.g.(
classpath 'com.android.tools.build:gradle:1.2.3'
)
The issue seems to be a gradle version related issue.
Let us know the details so that we may further assist.
Thanks!
[1]: https://github.com/gradle/gradle/blob/master/subprojects/core/src/main/groovy/org/gradle/api/internal/project/ProjectInternal.java