The following error in the burst Activity Log occurs on EXPORT of a WebI document:
Request failed with Http Status=404
This may be followed by this System Error:
Error ==> Value cannot be null. Parameter name: path
This issue occurs when Bursting a WebI report if the following are true:
1. Tab splitting is being used via the "Perform Split" option in the delivery, and
2. The report tabs are named with numeric values.
This issue will be addressed in build 234. If you run into this issue, you can work around it by renaming the tabs with string values.