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Invocation of method 'get_Item' in System.Collections.Generic.IDictionary`2[System.String,System.Object][] threw exception System.ArgumentOutOfRangeException : Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index

Modal dialog

You won't be able to dismiss this by usual means (escape or click button), but you can close it programatically based on user choices or actions.