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I have just taken a new Alloy site and first upgraded it to the latest version of EPiServer and then added EPiServer Find to it.
Doing that I got this error:
Cannot add duplicate collection entry of type 'add' with unique key attribute 'name' set to 'ExtensionlessUrlHandler-Integrated-4.0'
When I open up web.config I can see that I have two items for that handler that looks like this:
I think the one with verb="*" is the lastest one.
I solved it by removing one (the one with all verbs declared) but could be good to know for you and anyone else that get this error