Task step failing in process model

Hi,
I have a process model which has a task step. I was trying to test the interface wih high load, i.e with around 10 MB as input. Although all previous steps have completed successfully, at the step of the task, an exception is thrown as follows:
‘org.xml.sax.SAXParseException: Premature end of file’ at wm.task.taskclient.controlTasks(taskclient.java:273).
The process name is: wm.prt.monitor:changeProcessStatus.
Has anyone encountered this error before? There was another task based transaction with the same failure while trying to test with high load. So it looks like it is the load which is responsible for this error.
Regards,
Shaon

This post helped me

http://forums.sun.com/thread.jspa?threadID=524135

if it is the schema problem, download it and put it in local dir and point to the directory.