Error when enterring 'Costumize'

After having installed the Illdy theme, I haven’t been able to access the ‘Costumize’ page. I just get a HTTP ERROR 500. What to do?

Hello there,

I hope you are doing well today.

Please use the following plugin to check your PHP version, if it is below 5.6 then you need to contact your hosting provider to have them update it:

Best Regards,
Support

I am currently using 5.6, so that can’t be the problem.

Hello there,

Thanks for checking.

Please deactivate any third party plugins that you have active then use the following link to increase your WordPress memory limit:

Best Regards,
Support