This is the kind of error you can encounter after clicking the link in any kind of confirmation email from us. For example, in a withdrawal confirmation email.
The explanation for this error is simple: the link is expired. Every confirmation email has a limited lifespan. For instance, the withdrawal confirmation link is only active for one hour. In case you click the expired link, you receive the "Invalid token" error notification.
Just initiate another withdrawal, or whatever action you've been planning to confirm via email, and your problem should be solved.
If you have any questions, please feel free to contact us firstname.lastname@example.org