User cannot authenticate nextcloud

When any user from my nextcloud tries to log in, entering the correct username and password, after clicking on enter the page reloads and returns to the login screen.

I went into the nextcloud.log file and it returns some authentication errors:

This error started by itself, I didn’t make any changes or settings at first

hi @kauemezzomo you are missing the required support template. Please fill this form out and edit into your post. This will give us the technical info and logs needed to help you in case the machine in question in spitting out errors! Since you’ve provided zero technical details it is impossible to help you as-is. Thanks.

Please use the search - lot of issues have been discussed already

If there are specific issues or error please describe what you tried so far and which problems you hit!