Most likely you're unable to login because of a typo in your email address or you're using the wrong email address all together. Please make sure you're typing everything correctly! It can also be helpful to reset your password. You can learn how to do that here.
If the problem persists after taking these steps, please contact Viki Community Support so we can help! Be sure to include other email addresses you have so we can search our user database for your account.
Please always be sure to check our Help Center's Twitter page, @VikiStatus, to stay informed about major issues with the Viki website and apps.