After Clicking submit it shows 503 error using Calvin's template

[Smallan]

Good day!

I'm really new to pfsense, just literally installed yesterday.

2.3.3-RELEASE-p1 (i386)
built on Thu Mar 09 07:17:43 CST 2017
FreeBSD 10.3-RELEASE-p17

I'm having problems with my Captive Portal. Currently using Calvin's Template (https://calvin.me/pfsense-captive-portal/) unmodified except for a Logo. When users click submit, it gives an error 503 then if they try to connect to the wifi again it will just auto connect. I also have a redirect url set to an FB page.

Is there a setting I'm missing so that when clicking submit they will be connected right away and wont have to try twice?

Thank you!

Update:
Tried other templates or even the default and its still doing the same thing. Tried to reinstall 5x and no luck.

[odix]

Make sure this tag is not missing inside the form tag of your login page. I use Calvin's as well, it used to work on the 2.2 version, for it to work on 2.3 you must add the tag.