Somebody can help with this message, please, I can't execute tool "Attach Surfaces" on Maya 2012.

Code:

attachSurface  -ch 1 -rpo 0 -kmk 1 -m 1 -bb 0.5 -bki 1 -p 0.1 "loftedSurface2" "loftedSurface3" ;

// Warning: Doing attach with history on may result in odd behaviour in the future when the objects are modified. //

// loftedSurface2attachedSurface1 attachSurface1 //

thanks in advanced.