Fail2ban setup issue '\ufeff\n'

following this manual: https://download.seafile.com/published/seafile-manual/security/fail2ban.md
I get the following error when restarting

Sep 21 18:13:09 server fail2ban-server[3203]: Failed during configuration: Source contains parsing errors: ‘/etc/fail2ban/filter.d/seafile-auth.conf’
Sep 21 18:34:29 server fail2ban-server[3286]: [line 5]: ‘\ufeff\n’
Sep 21 18:13:09 server fail2ban-server[3203]: [line 10]: ‘\ufeff[Definition]\n’
Sep 21 18:13:09 server fail2ban-server[3203]: Async configuration of server failed

this is my config:

GNU nano 2.9.3 /etc/fail2ban/filter.d/seafile-auth.conf

Fail2Ban filter for seafile

[INCLUDES]

Read common prefixes. If any customizations available – read them from common.local

before = common.conf

[Definition]

_daemon = seaf-server

failregex = Login attempt limit reached.*, ip:

ignoreregex =

DEV Notes:

pattern : 2015-10-20 15:20:32,402 [WARNING] seahub.auth.views:155 login Login attempt limit reached, username: , ip: 1.2.3.4, attemps: 3

2015-10-20 17:04:32,235 [WARNING] seahub.auth.views:163 login Login attempt limit reached, ip: 1.2.3.4, attempts: 3