[Plugin: WP Custom Admin Bar] Plugin causes error on login page. Had to be removed from server

I have WP 3.4.1 and WP Custom Admin Bar 1.3.5 running for a couple of weeks now and everything worked fine until today. This morning I suddenly could no longer login on my own website. On the login page, various error messages occurred, all referring to the WP Custom Admin Bar Plugin. I had to remove the entire plugin via FTP from the server in order to get the login page working again. For a screenshot of the error message, please see https://docs.google.com/open?id=0BzGUwshSpDEeNkFJNVIwSW1TSGc. Hope this can be fixed somehow, as otherwise this is a great plugin.

https://www.ads-software.com/extend/plugins/wp-custom-admin-bar/