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Usually, cross site request forgery (CSRF) tokens work by getting them in the reponse header on your first request on the site. The browser then sends this token in the encrypted HTTPS header every time a changing operation (such as posting something) is done.
If the browser doesn't send this token, you would get this error. If you are savvy enough, you can check if the CSRF token is actually there. You could also try logging in from another browser. (As a last resort I'd ask the site admin.)