In most cases, should your e-mail address be correct it may be the case that your password is not. Sometimes based on the web browser you're using may auto fill the password field with a password that it assumes is for your Upad account.
Just to make sure, please make sure that the password field is empty and manually type out your password.
Should it not work, click here to reset your password, where you'll be sent an email to update your password to enable you to log into your Upad account.