It looks like there may be some permissions problem, as apparently you are not allowed to access your own home folder.
What happens if you do Cmd-Shift-H in the Finder? (this should open your home folder, but since it appears dimmed, you may not have permission to).
Go up to the Users folder in the Finder. What do you see?
If you see the icon for your home directory (it should be named Oli and have the 'home' icon), does it have a forbidden sign on it? Click this icon and hit Cmd-I to open the Get Info window. What do you see under "Permissions"? It should be something like the image below. If you don't have "read and write" permissions, that could be the cause of the problem. You may try to fix it by clicking the padlock icon, enter your password and then changing the permissions. But I wonder how that may have happened in the first place (if it is the case).