It looks like you are deploying a JPDL file. When you define the process you need to give it a key. Can you verify that the Process starts something like this:
<process key="LeaveApply" name="LeaveApplyProc" version="1" xmlns="http://jbpm.org/4.4/jpdl">
...
</process>
That's all I can think of that might cause that error.
Jim