Thank you for your suppport, based on this latest link I was able to make this work, I followed the instructions and it worked.
Thank you!
@mbrsolution Thanks for the quick reply.
I don”t have any cache plugin on the WordPress neither the server seems to be running any, we’ve been using this plugin for a while and nothing has been changed lately, last time was used on September 2024 and it worked well.
The only changes have been done (after getting the error) are that we updated the WordPress to its latest version, we upgraded our php version from 7.4 to 8.1 and all plugins are to update, but no new plugins have been added.
Sidenote, old created links work well but if I try to customize them with new information then they stop working (and I get the error message), this happens when creating variant groups.