Hello,

Sorry to say I am unable to do anything due to your server issue. You have checked with the default theme and the issue still remains. It means it is not our theme issue. Please contact the woocommerce community in this regard. They will guide you better.

Also read the discussion here and check the issue:
https://wordpress.org/support/topic/error-there-was-an-error-getting-your-inbox/

Best Regards.