Hoopla app won't log in

I'm trying to log into my hoopla account through my public library and I can't get it to work at all.

I've tried logging into hoopla through my desktop and my account is working fine, so I know the password isn't the problem.

Every time I enter email address and password on the Boox, then click Log In, this little white box pops up under the menu, then nothing happens. It's like an empty error message or something.

Anyone have any experience with this?