Applescript to change illustrator colors -

I am trying to change one color in a painter document with one color and the other I have found but it It keeps saying that "color is not found" I'm not sure what I'm doing?

  Tell the application "Adobe Illustrator" if the color is present then "C = 0 m = 0 y = 0 k = 90" then "C = 0 m = 0 Y = 0 K = 100 "Set the color to the end if tell the end    
 
 
  Set up "Adobe Illustrator" Set all the documents on each path item in the current document whose fill color is {Cyan: 0.0, Magenta: 0.0, Yellow: 0.0, Black: 90.0} with all the items in my IITs. Repeat myItem the {cyan: 0.0, magenta: 0.0, yellow: 0.0, black: 100.0} end repeat end set Fill Color