is this GNAT error message confusing or am I confused or both?

[Robert Dewar]

Georg Bauhaus wrote:

>> Richard Kenner wrote:

>>> I'd reword it as
>>>     selected component has invalid prefix "X"

> I for one find these messages easier to follow.
> 
> Maybe less clear but in line with the other "invalids"
> 
>    invalid prefix of a selected component: "X"
> 
> Or, if possible
> 
>    invalid prefix to selector: "X"

I prefer Richard's first selection, to me it reads more
naturally, and the use of colon this way is out of style.