Warning: require_once(http://ift.tt/2qzG5tO) DOMPDF

This was my first time trying to play around with dompdf. I had everything set up and uploaded to my site. However when I test it, it has problems loading the dompdf files. These are the 2 errors I get.

Warning: require_once(http://ift.tt/2rTfL1D): failed to open stream: No such file or directory in /home/u263223815/public_html/form/cetak.php on line 169

Fatal error: require_once(): Failed opening required 'http://ift.tt/2rTfL1D' (include_path='.:/opt/php-5.6/pear') in /home/u263223815/public_html/form/cetak.php on line 169

I looked in the classes folder and there were no such files. Where are these files? Am I doing something wrong?

Thanks!