Warning: Unexpected character in input: ''' (ASCII=39)

[eluser]Unknown[/eluser]
Good day! I hope somebody could help me with this.

My site runs perfectly in localhost, but when I uploaded it to a subdomain in cpanel this error appears:

Warning: Unexpected character in input: ''' (ASCII=39) state=1 in /home/gpolg/system/helpers/file_helper.php on line 357

Parse error: syntax error, unexpected '/' in /home/gpolg/system/helpers/file_helper.php on line 357

In said line is this (include(APPPATH.'config/'.ENVIRONMENT.'/mimes.php'):

Code:

if ( ! function_exists('get_mime_by_extension'))
{
function get_mime_by_extension($file)
{
  $extension = strtolower(substr(strrchr($file, '.'), 1));

  global $mimes;

  if ( ! is_array($mimes))
  {
   if (defined('ENVIRONMENT') AND is_file(APPPATH.'config/'.ENVIRONMENT.'/mimes.php'))
   {
    include(APPPATH.'config/'.ENVIRONMENT.'/mimes.php');
   }
   elseif (is_file(APPPATH.'config/mimes.php'))
   {
    include(APPPATH.'config/mimes.php');
   }

   if ( ! is_array($mimes))
   {
    return FALSE;
   }
  }

The hierarchy of the subdomain is:
home/gpolg/
-application
-system
-public_html
--mytestsite/
---index.php
---.htaccess

I've tried moving the app and sys folder (changing the paths, of couse), to the public mytestsite folder with the same result.

The only ENVIRONMENT I could find was in the index.php, which i changed from development to testing and back.

I know is something I did wrong... but I can't find it out. Any ideas why is this happening? Thanks in advance.