Error: We’re updating your inbox, please wait a few minutes and then try again.

Second day I can't open mailbox! help please! Since yesterday, I can't open mailbox.
it showing error page when i login to my mailbox.
I'm trying indifferent computer, and still persist this problem today.
I need urgently solve this problem, please someone help me.

here is the screenshot of error page when i login to my mailbox >>>
it showing error message: we're updating your inbox, please wait a few minutes and then try again.