Everyone has been posting this question on answerHUB and nobody got an answer. What is this and how do we fix it?
Hello everyone,
I tried launcing my project for Windows, but It always gives me desciptor file error. Can anyone help?
I am attaching error log.
Make sure to take a look at some other threads with the same error: https://docs.unrealengine/latest/INT/Search/index.html?q=descriptor+file&x=0&y=0 -> probably one of the solutions will work 
Check if the project file is still at the right place (in your project folder) + which engine version do you use? + have you already tried to package it with “shipping”? + please post the link to your answerhub thread