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I get a pop-up windows " Internal Server Error "
The only way to see soe detail is to open bugzilla, where the call on "join group" link give this:
{"Message":"An error has occurred.","ExceptionMessage":"Riferimento a un oggetto non impostato su un'istanza di oggetto.","ExceptionType":"System.NullReferenceException","StackTrace":" in DotNetNuke.Modules.Groups.ModerationServiceController.JoinGroup(RoleDTO postData)"}
and this error:
in DotNetNuke.Modules.Groups.ModerationServiceController.JoinGroup(RoleDTO postData)