Hello @Maky,
We apologize for the inconvenience, but it appears that the issue you are experiencing is related to a child theme. As per the error message, it seems that the error is stemming from the functions.php file of the child theme.
We kindly request that you check your changes in the functions.php file of the child theme. We understand that custom code can be challenging and we are here to assist you in any way we can.
Please be advised that we are not responsible for custom code in your child theme and would advise consulting a developer for further assistance.
Sincerely,
8Themes Team