Invalid object specification showing While log in into RT from POSTMAN

I tried to login into my RT account from POSTMAN using the following URL

I got the following error as the response

RT/4.4.4 200 Ok

Invalid object specification: ‘’


Why it’s happeing. Can someone please help me to sort out this issue

You’re not asking for anything from REST, such as ticket(s)/user(s) etc the error is saying you didn’t specify what you want