Wordpress: jQuery not loading. : In the contact form section of my wordpress site, i'm trying to disable the line break from the text area (e.keycode 13). Here's the jQuery i'm using:
[jQuery][1]


But the script doesn't seem to be loading properly; I get an error on the console as below: 
[console][2]


  [1]: https://i.stack.imgur.com/pb8yx.png
  [2]: https://i.stack.imgur.com/PTZmh.png

Any ideas why this is happening? I'm using the plugin Header and Footer Scripts to add the script to my wordpress theme and i'm using Contact Form 7 for the form. 
Having searched a lot for the solution, this is my last hope so any help would be appreciated.  