PHP problem in wordpress theme fashion design Themeforest

Dear all,

At this moment i’m working on a template from theme forest but now replies. Hopefully someone can help me with the following problem.

https://www.brentz.nl/new/wp-admin/admin.php?page=functions.php#tabSEO

as soon as i went into the theme lots of programming issues are not working,
also top screen of the menu can’t be seen.

if i want to insert an image it is not clickable.
I think this has to do with an php error.

Can someone help me with this problem

kindest regards,

Karin ellermann