Drupal D7 Ellfinder elfinder-7.x-2.x-dev error "Invalid backend response.Data is empty"

I have a very strange situation with Elfinder. I developed a Drupal D7 website on a development (Ubunt 12.04) server. Everything, including CKEditor and Elfinder works perfect. I migrated the website (file system and mysql database) to a Zpanel Linux Ubuntu 12.4 server and I didn't get elfinder working any more. I tried everything i Read about this: File permissions, php libraries, Drupal modules, JS Elfinder libraries, /tmp directory, mD7 module setting. I checked it all more than once without any succes.

The problem occurred with this version:

  • Drupal 7.26
  • D7 module elfinder-7.x-0.8
  • elfinder library elfinder-1.2

I finally managed to get elfinder working with this versions:

  • Drupal 7.26
  • D7 module elfinder-7.x-2.x-dev
  • elfinder library elfinder-lib-2.1-20140220_000018.tar.gz

After installation I got this error while opening elfinder:
"Error: Invalid backend response.Data is empty." popup.

And then I followed this modification:
Go to file: "elFinderVolumeDriver.class.php"
File Directory: on local host or web hosting search:
File: "elFinderVolumeDriver.class.php"
Open the file with an editor:
Go to line 747 where the line "$this->_checkArchivers();" should be! And disable this line by adding double slashes "//" (Example: //$this->_checkArchivers();)

Thanks to Gauthier Domoraud

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