Cannot edit or make new coupon

[Cupidowijnen]

Hello,

I am not able any more to create new coupons or edit excisting ones in my Magento (1.9).

Those that I created earlier still work when you aply them to the shopping cart as a customer. But when I try to edit them or create a new one I cannot save them.

It gives me the error message (in dutch..): "Er is een fout opgetreden tijdens het opslaan van de regeldata. Herzie a.u.b. het log en probeer opnieuw."

Translation: "There has been an error during the saving process of the dataline. Please edit and try again"

I have tried to clear cache, log out and back in again with out results. Google search sessions did not give any answers. I was just preparing for a new summer discount coupon, so it would be great to hear some ideas.

Thanks in advance,

Jan Marten Cuperus
www.cupidowijn.nl

[Extendware]

Have you installed any extensions related to coupons recently?

[iweb_ejrowley]

You are seeing that error because of an exception, do you have access to var/log/exception.log? If so you could check what is causing the error there.