The url_rewrite field is invalid.

[Bocco]

I am using prestashop 1.7.5.0. I have 3 languages installed (english, slovenian, croatian). When editing SEO&URL I get error: The url_rewrite field is invalid. 

How to edit? Please help. Enabling Accented URL does not solve problem.

Edited February 12, 2019 by Bocco (see edit history)

[tdsoft]

Because some product have this URL Friendly, please change it to NEW URL or recheck your store

URL Friendly must is UNIQUE

[Bocco]

I have just deleted all products. Didn't solve problem. I am still receiving same error and can't edit seo&url.

[Bocco]

I found another post with seo&url problem, but they adviced me to start my own forum post to find solution. So If anyone knows how to solve problem - don't be shy - share with us

[Bocco]

OK, I think I have found solution. As @wmh90 explained problem derives in deleted languages which still remain in database. 

First of all make backup of your web shop before you make any changes. 

Go to backoffice to International/Localization/Languages and check for Id of languages installed.

Log into cpanel, phpmyadmin and locate your database and then search for psfm_meta_lang table. Open it and filter id_lang by ascending number of Id. Delete all pages of id languages you don't need them. 

Then go to backoffice of your prestashop store into Traffic&SEO. Now you can edit URL pages. If you have to use more than 1 word in rewritten url, use sign - between words, for example: page-not-found. And use only english letter a-z.