Error 1004 in range definition

Good morning,
I'm using Excel 2010. In a subroutine that has always worked well in other programs, it now appears an error message 1004 in the definition of a range
Example:

With Worksheets(Ws$)
Debug.Print .Cells(5, 3).Value                          'OK
Debug.Print .Range("C5").Value                   'OK
Debug.Print .Range(.Cells(5, 3)).Value 'Error 1004
End With

I do not understand. Any idea?
Thanks for your helping

Re: Error 1004 in range definition

Yes, it works very well.
At this point, however, I have two programs that use the same subroutine and the same worksheets.
It would be nice to understand why the first program works without . Address and here I must insert . Address
Greetings and thanks