Can't update to v0.18b

I’m trying to update to v0.18b, but keep getting an error. I can’t find/remember what I have change in the config files. How to get around/fix this?

username@box:~$ curl -s | sudo bash
Updating Mail-in-a-Box to v0.18b . . .
remote: Counting objects: 1, done.
remote: Total 1 (delta 0), reused 1 (delta 0), pack-reused 0
Unpacking objects: 100% (1/1), done.
error: Your local changes to the following files would be overwritten by checkout:
Please, commit your changes or stash them before you can switch branches.
Update failed. Did you modify something in /home/username/mailinabox?

Did you modified anything?