Jquery error Object doesn't support this property or method error

I have a ruby application. I am ge开发者_如何学Ctting the error "object doesn't support this property or method" which corresponds to the following line in my application.js file.

$('textarea.autoresize').autoResize({
  onResize : function() {$(this).css({opacity:0.8});},
  animateCallback : function() {$(this).css({opacity:1});},
  limit: 300
}).change();

Please let me know what changes are required.