Joomla 4.0.6

i'm using joomla 4.0.6 and helix ultimate 2.0.6, but when i want to edit template options, then my website loads with a white page and the following error;

Default Layout file is not exists! Please goto to template manager and create a new layout first.

is there a solution to solve this problem?

Advanced Template Manager is compatible with Helix Ultimate 1.1.2. Just don't upgrade to a newer version.

Where can i disable advanced template manager ?

Can i give you (super) admin and you can take a look ?