Coursepress login error, URGENT

Hi, On one of my coursepress sites (http://www.saeni.com.ar/online), when I try to login from http://www.saeni.com.ar/online/ingreso/ I get this error:
ERROR: Sorry, there was an error. Please be sure JavaScript and Cookies are enabled in your browser and try again.

You can try with this user and pass:

[sensitive data removed by staff member]

Support access is also granted.

Thanks!

PS: It is an urgent issue, I am in the middle of a promotional campaign and I am loosing sales!
Thanks again