there are also error reported in the js/prototype.js file, remove the reference to that file.
the errors in the js/prototype.js file may be the cause of the problem in the SpryAssets/SpryValidationTextarea.js file.
javascript can sometimes be a house of cards, when one script starts causing errors, it will cause the other scripts on the page to faile.
if that does not work, you will need to begin stripping the page one piece at a time to find the problem.