Error building the category permalinks

You are putting the literal ‘a’ in your permalink…why??
try changing the permalinks to

/%post-id%/%postname%/

Hi,

With that config it works well, I already tried that. But why the /a/ gets attached to the category permalinks?

anything you put in your permalink other than the %…% strings will show up as part of the url. That is why the /a/ shows up.

Now the reason you are having a problen is that you are using a dash instead of an underscore – you have %post-id% when it should be %post_id%

BUT why are you even using post ID?

My mistake, is not /%post-id%/%postname%/ but /%post_id%/%postname%/

BUT why are you even using post ID?
This is a customer worpdress with a previous configuration. I wouldn’t use the id either, just the post name.

anything you put in your permalink other than the %…% strings will show up as part of the url. That is why the /a/ shows up.
But it shows up even in the category permalinks?

The ‘a’ shows up because it is literally part of the permalink
the word ‘category’ shows up because that is what is used inplace of the %post_id%
if you go to an archive page, you will see ‘date’ in the %post_id% position

and why do you think the /a/category-name generates a 404 error when /category-name works correctly? Why the router is not able to manage the /a/ literal?

Why the router is not able to manage the /a/ literal?

Router?? A router is a piece of hardware and has nothing to do with this.

Where are the bad links? can you provide a url that exibits the issue?

router/url resolver. Sorry, using the symfony terminology https://symfony.com/doc/current/book/routing.html

example:
category: technology

url generalted in the links: /a/technology and that generates a 404 error.

But if I go to /technology I can see the category correctly

Can you provide the url that exibits the issue so I can see it?

mediatrends.es/a/informatica

What happens if you disable the yoast seo plugin?

same problem, just tried

So this is in the MENU that the problem occurs. How is the menu created? Is it an automatic menu generated by the theme or is it a custom menu?

If it is made by the theme then is is going to be a theme issue.

Test this out by adding the category widget to the site and see if that works.

good point. I just checked, it doesn’t look a theme issue thought, in wp-admin the category links are also generated with the /a/ prefix

Did you try adding in the category widget toa sidebar and testing that?

the /a is not the problem, it is the missing word ‘category’ – although I just tested using https://www.mediatrends.es/category/informatica/ but it gets rewritten to https://www.mediatrends.es/informatica/ which points at your htaccess file.

you need to go back to basics.
1) disable ALL plugins
2) change the permalinks to the default
3) do the links work? if the answer is yes continue

4) change the pemalinks to /%post_id%/%postname%/
5) do the links work? if the answer is yes continue

6) change the pemalinks to /a/%post_id%/%postname%/
7) do the links work? if the answer is yes continue

8) activate all the plugins
9) do the links work?
— if the answer is no, the cause is a plugin.