unable to execute user decision..

[priyank dev]

hi ppl,
         while executing the simple user decisions.Iam facing a lot of
errors.Do i need to do any modifications in swu3.These are the errors which
i copdied form WF error log-

Executing flow work item    Work item 000000391109: Object FLOWITEM method
EXECUTE cannot be executed
Executing flow work item    Error when processing node '0000000004'
(ParForEach index 000000)
PROCESS_NODE             Error when processing node '0000000004' (ParForEach
index 000000)
CREATE                           Error when creating a component of type
'Step'
CREATE_WIM_HANDLE    Error when creating a work item
GET_WITYPE                   Unable to determine work item type for step at
node 0000000004
GET_TASK_HANDLE        Error when loading task
Exception occurred            Error when starting work item 000000391109
CREATE_VIA_WFM          Error within method
CL_SWF_RUN_WIM_FACTORY->CREATE_VIA_WFM
FIND_BY_WFDWIZ           Task definition '' not found
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mailman.mit.edu/pipermail/sap-wug/attachments/20090331/501d7802/attachment.htm