You are missing commons-digester3-3.2.jar
from Apache Commons Digester. If you are using Maven you can add:
<dependency>
<groupId>commons-digester</groupId>
<artifactId>commons-digester</artifactId>
<version>2.1</version>
</dependency>
to your project dependencies.
Update:
The jar from the latest download page has a slightly different package structure to what your application expects. You can use this older jar instead.