First of all, you've build a nice little module which is working very good so far (for one minor error which is probably caused by me ):
I'm encountering an error when submitting an email adress in the module in the front end of the website http://www.offsetagency.nl/joomla
I saw another thread in this forum from a person with the same error message. I've looked into the solution you provided to him.
I have no other clues as to where this error is comming from.
Do you have any more suggestions where I should look?
many thanks in advance