Not sure if you found a solution, but here's what my problem was. I was sending the same date for startDate and endDate, which returned a 404. Make sure that you are sending a valid startDate and endDate Hope this helps somebody else that stumbles across this thread.

I found the answer. The issue was that I was setting Launch screen interface file base name to LaunchScreen.storyboard. The solution was to remove the extension - I only had to provide LaunchScreen.