hi! can anyone help …why this error is coming on my day13 of 30days challenge??
Hey @milindrai 
Welcome to the Postman Community! 
Have you ensure that you have followed the instructions correctly and have all the required data in place, as per the details listed?
yes…i have done all the steps
I would recommend reading step one again and checking the request name you have in place, to compare it to the instructions.
the remaining test cases passed…
I don’t know how you’re setting that Collection variable, that would be part of the images you shared.
That would be from a script you have added to one of the requests and then stored at the Collection level.
For each fail, the assertion message is telling you what to check.