Invalid Ticket Id, code 4834

I can't use the API because i'm receiving an error:

{"response":{"error":{"message":"Invalid Ticket Id","code":"4834"},"uri":"/crm/private/json/Potentials/getRecordById"}}

https://crm.zoho.com/crm/private/json/Potentials/getRecordById?&authtoken=myauth&scope=crmapi&id=372508000001521005

why? before it worked.