ifttt and salesforce integration fails

I use it for sending simple messages from Ifttt to chatter. When we try to authenticate, we get an error output from this site.

https://ifttt-salesforce.herokuapp.com/

Oops, an error occurred

this exeption has been logged with id ******.

Our environment has single sign on enabled, so we are authenticating from a custom domain.

The version of the package is 1.8.

Please let me know what I need to do to identify the problem.

Thanks.