Empty email, builder issue

Your software
My Mautic version is: 4.0.2
My PHP version is: 7.4
My Database type and version is: 10.3.31

Your problem
My problem is:
When I select an email template or create new template from the builder,
after click on save and close the buttons just disabled and nothing happen,
after check the link of preview just a blank page,
and if I send email to contact the email sent but empty.

Please any one can help asap !!

These errors are showing in the log:
libraries.js?v90239efe:766 POST https://demo.comeit.ma/s/emails/edit/2?mauticUserLastActive=693&mauticLastNotificationId= 403

Thank you .