What is the error in the code for working with ads through the VK API?

Question

PHP

Good afternoon!
There is a code that should receive the user's token after authorization, substitute this token in the request to edit the ad: https://www.dropbox.com/s/3ggdgudzctaezzp/vk.php?dl=0
But when trying to execute this request ( that is, just go to the page with this code) gives a 500 error. Tell me, please, what is the error?

Answer 1

Who will close the curly braces?
https://gist.github.com/riot26/34977a6714514396089...