Having trouble generating tokens

For some reason I am having trouble with the API in terms of it is not letting me generate Authentication Tokens, I am calling this URL

https://accounts.zoho.com/apiauthtoken/nb/create?SCOPE=ZohoCRM%2Fcrmapi&EMAIL_ID=zach%40parrot-uni.com&DISPLAY_NAME=YourCRM.Link&PASSWORD=83*********************************

I had copied the email address and password from the web page, when I tried to create a token from the web page it said I had too many, Is there a way to erase them as I did create a bunch while testing