Build error

Hi
I'm having this error trying to run the task:

```
FAILURE: Build failed with an exception.

* Where:
Build file '/Users/hamen/code/catapush/library/app/build.gradle' line: 364

* What went wrong:
Execution failed for task ':app:releaseNotes'.
> Error creating extended parser class: null
```

Line 364 is

```
def pdp = new PegDownProcessor()
```

I'm using Java8, Gradle 2.6.
Any help, please?
