# Extending Foot - unknown category\_url function
**URL:** https://forum.shopware.com/t/extending-foot-unknown-category-url-function/86335
**Category:** Themes & Design (EN)
**Created:** [19. März 2021 um 21:00 UTC](https://forum.shopware.com/t/extending-foot-unknown-category-url-function/86335 "2021-03-19T21:00:53Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@towo1977](https://forum.shopware.com/u/towo1977)
#### Post date: [19. März 2021 um 21:00 UTC](https://forum.shopware.com/t/extending-foot-unknown-category-url-function/86335/1 "2021-03-19T21:00:53Z")
I try to extend/modify the footer.html.twig
i copied the twig to modify it in my theme.
at calling frontend i get error 500 cause of „unknown category\_url function“ which is in original File
do i have to include something somewhere else in my theme?
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### Author:  [@Shopwarian](https://forum.shopware.com/u/Shopwarian)
#### Post date: [21. März 2021 um 16:42 UTC](https://forum.shopware.com/t/extending-foot-unknown-category-url-function/86335/2 "2021-03-21T16:42:34Z")
It is hard to evaluate, when you have not posted, what changes have you done, but in general, I think you should rather extend the templates, then copy them. Please see [Shopware 6: Extending a storefront block](https://docs.shopware.com/en/shopware-platform-dev-en/how-to/extending-storefront-block).
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### Author:  [@towo1977](https://forum.shopware.com/u/towo1977)
#### Post date: [25. März 2021 um 18:19 UTC](https://forum.shopware.com/t/extending-foot-unknown-category-url-function/86335/3 "2021-03-25T18:19:55Z")
currently i just copied the original. (like i wrote 🙂 )
i´d like to edit the css classes in Block layout\_footer\_navigation\_column
in this block you have links which get there url with \
### Author:  [@Shopwarian](https://forum.shopware.com/u/Shopwarian)
#### Post date: [26. März 2021 um 09:57 UTC](https://forum.shopware.com/t/extending-foot-unknown-category-url-function/86335/4 "2021-03-26T09:57:17Z")
> [@towo1977](#):
>
> footer.html.twig
Are you sure, you have copied it correctly from vendor/shopware/storefront/Resources/views/storefront/layout/footer/footer.html.twig to your theme directory?
I have no such thing as category\_url in my version of this file. Perhaps you are using some third party theme or plugin, that expects to have category\_url method available?
In general, you can create links to categories like this:
```
`{{ seoUrl('frontend.navigation.page', { navigationId: category.id }) }}`
```
So whatever you have in there for generating category urls, you can replace it with the fore mentioned code…