guild charter doesn't allow me to click "sign charter"

I have tried different names with different characters on my account and it doesn't work... the "Sign Charter" is not clickable... I tried deleting cache WTF and interface and still nothing..

http://s9.postimg.org/bcjqj00yz/Wo_W...816_135228.jpg

https://www.warmane.com/bugtracker/report/17153