What API are you trying to call? What are the headers you are trying to pass?
That error means you did not pass in the right sessionID on the header. That means you either did not login to get the sessionID or you passed the wrong header label depending on the API.
We need more info to heklp debug.
Hi Mohammed ,
Which API URL are you using ?
Is it REST API provided by Informatica or taskflow resource URL?Hope you have access and you are passing the user details or icsessionID in header .