I have a big problem... Issue

I've already installed your last version B2J (2.1.17) on a joomla (3.6.5).
After submit the form I get a blank page with only this: The last request was denied because it contains an Invalid Token (invalid operation). Please reload the page and try again.

I'm in a big trouble because is a very important website.
Please, do you know something about it?

Thank in advance.
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