Hi! Sorry, but all the other topics seem to work with the memory solution, but not for me.
My memory limit on php.ini is 512M (my host provider put this) and my wp-config is 64M.
I've deactivated the plugin and activated it again.
I've deleted all unused plugins, including its files.
The mistery: I have a working form at my website, I have always been using the forms...this problem seems to be new.
Please help me.