Add-On Help: Security Error

[Tristan10]

I just finished follow this tutorial:

https://xenforo.com/community/threads/how-to-read-and-write-into-the-database-with-a-page.23560/

because I want to get into making my own add ons. However after completing it, when I test out the add-on I get the error:

Security error occurred. Please press back, refresh the page, and try again.

What causes this error and how can i fix it? Thanks.

 

[Thomas.B]

HTTP POST requests need to include a valid CSRF token. It should work if you add the following input element to the form:

<input type="hidden" name="_xfToken" value="{$visitor.csrf_token_page}" />​

 

[Tristan10]

HTTP POST requests need to include a valid CSRF token. It should work if you add the following input element to the form:

<input type="hidden" name="_xfToken" value="{$visitor.csrf_token_page}" />​

Thank you. Do you think you could explain in detail? I am brand new to add-ons and basically every part of coding them.

EDIT: I figured it out.