I know this is an older post but found this post searching for this same error I ran and though I would share my findings. I had the same error after adding a new package that had its own routes with views. It seems you will get this error when a view is rendered on a route that does not use the theme middleware. Once i added the theme middleware to my routes the exception stopped.

@hChamran
You can use the flatpickr-jdate plugin to add Jalali (Persian) calendar support. Have you tried integrating it yet?

@maheshb Doodle Jump
You can add a CC email by modifying the order confirmation mail class. In OrderMail.php, use the ->cc('email@example.com') method when building the mail. Make sure it's done where the mail is dispatched after order confirmation.

i also face this type of issue while i try to open ( https://www.easyreturn.co.in/ ) in private mode. this issue may be solved automatically, because some time SLL not load with website

@eldomagan_ Thank you so much! You truly saved my day.
This issue had really been driving me crazy, and I genuinely appreciate your help and support.
Cheers!