[تم الحل] Database and encoding Problemes

Background of the issue:
I want to send translations on my site الرابط المخفي. Unfortunately, I get errors related to database tables and encoding issues. The errors include: 'Wir haben ein Problem mit einigen Tabellen in der Datenbank erkannt. Bitte kontaktieren Sie den WPML-Support, um dies beheben zu lassen.' and 'WordPress-Datenbankfehler: Die Abfrage konnte nicht ausgeführt werden, weil sie ungültige Daten enthält.' Additionally, I receive a message that WPML cannot send some content for translation due to encoded fields, specifically Base64 encoding. The affected documents are listed with their IDs and descriptions. When I click the 'how to solve this problem' link, it leads to a 404 Page.

Symptoms:
Database errors and issues with Base64 encoded fields preventing translation.

Questions:
How can I fix the database table issues mentioned in the error message?
How can I resolve the issue with Base64 encoded fields so that WPML can send the content for translation?
Why does the 'how to solve this problem' link lead to a 404 Page?