[تم الحل] Problems with migrating from polylang and over to WPML

Background of the issue:
I am trying to migrate from Polylang to WPML for my site الرابط المخفي. I have followed the documentation at https://wpml.org/documentation/migrate-polylang-wpml/.

Symptoms:
The result was missing default language pages. I have tried it out a few times but the same error happens.

Questions:
Why are the default language pages missing after migrating from Polylang to WPML?
How can I successfully migrate from Polylang to WPML without losing default language pages?