Action you have requested is not allowed error

I made a module named Gallery which works fine on my localhost with version 2.0.3, but when using version 2.1.0 on a remote site I can not submit a form and I get the error:

The action you have requested is not allowed.

Why is this?

Solution

It is a Codeigniter error related to the CSRF protection. You can cancel it in cms/config/config.php

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