I really hate to revive SUCH an old thread, but I just encountered this error running DNN 4.8.4.
I'm assuming it's a hosting issue. I have a coupe sites with the same host (based on the same account) and they both give me this error when I go to Admin->Languages.
I uploaded 1/2 dozen or so modules that I was upgrading and when I was going through checking them one came up with the error
"Cannot create an object of type 'System.Globalization.CultureInfo' from its string representation 'English (United States)' for the 'Culture' property."
There's a little more to it, but it's just the stack trace back to InjectModule.
I've sent my host all the information from this thread and they are looking into it, but I was just wondering if anyone had any new pointers? I've noticed that the information about this error seems a little 'old', like this thread *smiles* but figured maybe someone at some point came across it and can offer something new?
Many Thanks.