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The reason why you get that error is because you have used more authorization tokens than your Zoho account is allowed to.
Do note that these are created for you automatically each time you use Zoho tools, log in and do similar actions, but it means that you have at that time had too many of them in their authorization token list.
You can see more about this here: https://zohoreportsapi.wiki.zoho.com/Prerequisites.html#authtoken
You can see on this page how to manage tokens: https://www.zoho.com/crm/help/api/using-authentication-token.html
If you need any further support with this you will need to contact Zoho support since that is the error from their system and as such only they can provide you with any further assistance.