Hi there,
I came across one issue after updating the meta box aio with the latest version.
I am unable to access my custom model link listed under my custom menu setting page.
I have created the demo Pastebin for your reference.
https://pastebin.com/J5ggFuGU

Here is the error screenshot when I click on my custom menu setting page.

Can you please look into it as soon as possible?
Thanks