Common Exceptions and possible reasons

class java.lang.NoClassDefFoundError

This is probably when you have a problem with the binary version of a dependency.

class java.lang.AbstractMethodError

This probably is also a jar version problem.

class java.lang.NoSuchMethodError

This probably is also a jar version problem.

class cascading.flow.planner.PlannerException

Cascading requires all sources to have final sinks on disk. This exception happens when you miss an output for an input.

class com.twitter.scalding.InvalidSourceException

This happens when data is missing from the path you provied.