This indicates that there is an error in the AJAX call. You can either check your network console in the browser (one of the admin-ajax.php requests should have an error in the response), or your debug.log. I need more information to determine what is causing this.
I am kinda surprised, though, that a second update succeeds.
Please find more information in the screenshots. My knowledge is a little poor on this, so I hope this information helps to find the issue (and solve it):
https://ibb.co/wg7MZ0C
https://ibb.co/VHdYJB4
Unfortunately, that doesn’t give the information that I was looking for.
I wrote a small document with steps on how to get the information. Hope that helps.
Please have a look at https://www.ek2024pool.nl/wp-content/debug.log
I am afraid a lot is going wrong 🙁
I see many references to old domain, most probably because I copied previous websites in the past.
I can’t help you with all the other errors and notices 😉, but the ones that are related to my plugin are all about a missing default ranking. Seems like you also managed to delete a ranking, or did something wrong when copying the database to the new site. My guess is that the latter is probably what happened.
My advice would be to start fresh with the plugin. Disable the plugin option to “keep data on uninstall”, then deactivate the plugin and activate it again. This will install all database tables and default data again.
