[Python] pyral create userstory gives error pyral.restapi.RallyRESTAPIError: 422 Could not...

I am trying to create a user story in rally using pyral. I get the following error

File "rally-post.py", line 46, in task = rally.put('UserStory', info) File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/pyral/restapi.py", line 1024, in put raise RallyRESTAPIError(problem) pyral.restapi.RallyRESTAPIError: 422 Could not read: Object not found for Object ID: null
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info = { "Workspace" : workspace,
"Project" : project,
"Name" : name,
"Description" : description,
"Owner" : _owner,
"SCHEDULE STATE" : "Defined",
"STORY TYPE" : "New Feature"}

user_story = rally.put('UserStory', info)

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