R ON Mac

hello, I have strange error.

gyliai<-read.table(file.choose(),header=T)
summary(gyliai)

         x                y           gylis    
 307577,08:  1   6124296,56:  1   3,00   : 59  
 308613,01:  1   6124353,50:  1   2,80   : 51  
 313800,45:  1   6124530,65:  1   3,10   : 36  
 313840,17:  1   6124970,20:  1   2,90   : 32  
 313864,05:  1   6124991,68:  1   2,70   : 22  
 313869,26:  1   6125009,34:  1   3,43   :  5  
 (Other)  :393   (Other)   :393   (Other):194  

coordinates(gyliai)=~x+y

Error in .checkNumericCoerce2double(obj) : 
  cannot retrieve coordinates from non-numeric elements

Your version of R is up to date


Error in .checkNumericCoerce2double(obj) : 
  cannot retrieve coordinates from non-numeric elements - whats is that
???? 

I use Gstat, mass, and sp packages. any ideas why this error shows to me?
I check it on windows couple days ago it worked fine, but not on my mac, I
don't have windows pc at the moment :) so help me :)

Gedas