Error 400 CSRF token validation failed. Bad Request?

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I’m having troubles to change my password too, my account on this website has been hacked and i’m trying to fix it as soon as possible, but when I try to put my new password a “CSRF validation code failed” appear “Error 400”, the message just tells me that a “Highly trained team of monkeys” will fix this problem, but i’m not sure about this, I will be pleased if someone help me.