I don't understand why it should fail.
Please try the following complete, modified on text event. I only changed the output a bit. Replace your current on text event with this one.
Code:
on *:text:*:#:{
  if (($me isin $1-) && ($chan != $active) && (!$read(Ti.Cercano.txt,w,$nick))) {
    echo -ta [10iNFO]08 $nick 10su11 $chan 10sta dicendo: 12«11 $iif(($len($1-) <= 77),$1-,$left($1-,77) $+ ...) 12»
  }
}