Fixing Wp Plugin Code (Encrypt-Decrypt and Forwarding) - New Worker is Welcome To Bid

Hi new freelancer I welcome new freelancer to bid, because this is just a small project fixing my wp plugin code. You must had experience and knowledge of costume plugin and good understanding of Wp to bid this work. Friend of mine, give me a script to masking of video source link with php. This script is masking with encrypting and decrypting the link. This is sample of working php script that he gave to me ==> [login to view URL] , print screen : [login to view URL] Because I use wp, so I try to convert this php script into wp plugin. But it get error and dont know what is wrong. I had created a dummy wp site, with basic code of my plugin that focusing only for this problem [login to view URL] I need your help to fixing this script, what is causing this script dont work php sample code and FTP account of dummy wp is available