No email messages appear. Yet, I am receiving error messages: "This message could not be moved to trash folder, possibly because your mailbox is nearly full. In that case, please try to empty your deleted items first, or delete smaller messages first."

I am unable to delete any emails in my inbox. I have only 10 in there and nothing in the trash folder. I have tried to delete one message at a time, but I still get the following below. Thank you

This message could not be moved to trash folder, possibly because your mailbox is nearly full.
In that case, please try to empty your deleted items first, or delete smaller messages first