500 Internal server error in Leads API

So I am creating an API for leads and when I test it in Postman it is working, sharing a SS for that and so later I created php curl code from Postman and when I run that API on my live server and localhost server I receive an error saying "500 Internal Server Error". 

Postman Screenshot:

Server Screenshot: 

<?php

$curl = curl_init();

curl_setopt_array($curl, array(
  CURLOPT_URL => 'https://api.getbase.com/v2/leads',
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => '',
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 0,
  CURLOPT_FOLLOWLOCATION => true,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => 'GET',
  CURLOPT_HTTPHEADER => array(
    'Authorization: Bearer xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx'
  ),
));

$response = curl_exec($curl);

curl_close($curl);
echo $response;

I have shared the code too just not sharing the Token. 
i did some research and found that if you receive this error in ZEndesk then take their help directly so posting this error here.