Rest API request Error

I have used the rest api for making request from postman. I have followed the instructions provided by the rasa core tutorials.

Here are some of snaps of how do i make a request using postman.

This snap is from my terminal where it throws the error as " ValueError: dictionary update sequence element #0 has length 3; 2 is required"

I have added the credentials while running up rasa core server, and also all required parameters for running up rasa core.

Please help me in sorting out this,

Thanks in Advance