After aliasing my account, the error “We’re updating your Inbox” appeared.

I've been having this problem since yesterdag afternoon, when I made an alias-mailaddress and I still can't acces my emails. I can login to my account but then the message 'we're updating your inbox, try again in a few minutes' appears, but now it's almost one day later and I still can't access my mail, not on the computer nor on my phone. Can this problem be fixed?