You have a syntax error in the src of your external script (note the extra space). This causes a reference error, as you can see in the F12 Console:
In fact, you don't need the line
Remove it, and simply move the inline <script> with the forms behaviors to just inside the closing </body> tag. Otherwise you're redundantly loading the forms library.
Also, please use the Advanced Editor's syntax highlighter when posting code:
Thank you very much, it worked!