I have this error on my site after I moved it from a shared hosting to a VPS (both with cPanel).
PHP Warning: include(): Failed opening '../../../transporturi/a.php' for inclusion (include_path='.:/opt/cpanel/ea-php70/root/usr/share/pear') in [...] on line 36.
In the other file on line 36 I have included a PHP file, I checked the path and it's there. I also tried to switch PHP version from the WHM from 5.5 to 5.6 to 7.0, but no luck.
The path is relative to the file that received the request, so you can use the PHP DIR magic constant to know what is your current directory:
echo(__DIR__);
and then form the absolute path relative to your file as below.
include(__DIR__ . '../../../transporturi/a.php');
Now it depends on your directory structure and the location of both the included file and the one where its included.