Error marking / unchecking the "Enable Social Login" option in the dokan plugin

Hello,
I think I have disabled all plugins not related to the theme.
I updated the theme according to https://xtemos.com/docs/woodmart/faq-guides/3-x-4-0-migration-guide/.
I switched to the parent theme to check the operation. But the problem still continues, then I leave my login information as administrator, Greetings, thanks.

Hello, although the problem started when modifying a Dokan configuration, it was Woodmart that failed because it did not resist compatibility with the Dokan plugin. This because, what I did was a simple modification, from the admin panel. I will try to see what they tell me from the support of Dokan and I tell them, of course it is not very fast because they take time to respond, I ask you please do not close the issue until you solve the root of the problem. Greetings.

Hi, I deactivated Dokan Lite and Pro and the error continues,
I found another forum ticket in which a user makes the same query and it is not seen in his screenshot that has dokan installed https://xtemos.com/forums/topic/warning-preg_match-compilation-failed-range- out-of-order-in-character-class /. I think this problem is the theme. And you with your knowledge should be able to suggest some modification for the file “/public_html/wp-includes/class-wp.php”

It is like any modification that you make in a plugin and fails in the subject, it is a problem of the plugin, but it is not like that, if I deactivate the plugins and the error persists then it is a failure of the theme, right?

Thanks in advance.

I removed the warnings by doing a restore with previous backup, but the problem was not fixed. Anyway, I appreciate the quick response to each comment.
Greetings.