Real Issue Tracker

I was running 0.7.2 version. I tried to upgrade it to latest version like 0.10.2 (using SVN as well as directly) .. After upgrade I press "Update Everything" in management Tab but it gave following error.

i initially thought that this is due to me directly jumping from 0.7.2 to 0.10.2 but i reverted back and tried upgrade to 0.7.3 also and i got the same error. Hence i later decided to work with 0.10.2 SVN version.. I can create new trackers but is not able to do many editing, add new issue and even search operations in old trackers.

details of error:

An error occured when I tried to...


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Error type: AttributeError
Error value: 'NoneType' object has no attribute 'getProperty'

Traceback (innermost last):
Module ZPublisher.Publish, line 101, in publish
Module ZPublisher.mapply, line 88, in mapply
Module ZPublisher.Publish, line 39, in call_object
Module Products.IssueTrackerProduct.IssueTracker, line 1764, in UpdateEverything
Module Products.IssueTrackerProduct.IssueTracker, line 2075, in AssertAllProperties
Module Products.IssueTrackerProduct.Issue, line 632, in assertAllProperties
Module Products.IssueTrackerProduct.Issue, line 229, in getFromname
AttributeError: 'NoneType' object has no attribute 'getProperty'