Image magic: resizing and filling don't work

that's what I'm doing:

convert input.png -fill white -resize 2480x3508^ out.png

      

        
        
        
      

    

and I get:

convert: invalid argument for option `2480x3508^': -resize.

      

        
        
        
      

    

Version: ImageMagick 6.2.8 06/11/08 Q16 http://www.imagemagick.org

The error does not appear if the '^' at the end of the Geometry argument is removed.