Why is my collection Runner always return 500 server Error but if i send my request without using collection runner it return success
Hey @fuadf.512
Welcome to the Postman Community 
Are all the requests tabs saved? Are all the variables in the Environment file? Are they all in the current value?
The 500 error is coming from the server, does that have any logging to show you what the error is?
It’s tough to know exactly what is happening here, given the lack of information and a few cropped screenshots.