Too many errors on archive and post

Hello,

Thanks for your support with fixing the previous error I reported.

I’m seeing lots of error messages on the amp post and archive pages.

For example this pages https://www.afterschoolafrica.com/scholarship/by-country/scholarship-in-germany/amp/
shows this error
Notice: Undefined index: ampforwp-custom-type-amp-endpoint in /home/aftersch/public_html/wp-content/plugins/accelerated-mobile-pages/templates/design-manager/design-2/archive.php on line 76

This page https://www.afterschoolafrica.com/12509/university-cape-town-klaus-jurgen-bathe-leadership-programme/amp/
show this error
Notice: Trying to get property of non-object in /home/aftersch/public_html/wp-content/plugins/amp/includes/class-amp-post-template.php on line 172

I was also getting errors for the Advanced AMP ads but had to comment out the lines of code causing the errors.

I’ll appreciate your help to fix this.