Message
The specified guid is not sufficiently unique.
Explanation
guids are defined as a globally unique identifier. While small positive integers may be unique locally, they do not sufficiently guarantee uniqueness across the range of all possible weblogs.
Solution
Consider an alternate source for GUIDs. Alternately, if the identifier is likely to be sufficiently locally unique, consider concatenating some part of your domain name to it.
Not clear? Disagree?
You might be able to find help in one of these fine resources.
