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Experience Profile Error – Sitecore 9.0.1

 Hi,

I’ve a problem when opening the Experience Profile it gives “An error has occurred.”, when I looked into the log I find this

Exception System.NullReferenceException: Object reference not set to an instance of an object.

   at Sitecore.Cintel.Endpoint.Plumbing.NegotiateLanguageFilter.OnActionExecuted(HttpActionExecutedContext actionExecutedContext)

 

 

Any idea what can be the problem?

 

Thanks