Title: Error when trying File Manager
Last modified: August 31, 2016

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# Error when trying File Manager

 *  Resolved [jsmall098](https://wordpress.org/support/users/jsmall098/)
 * (@jsmall098)
 * [10 years, 3 months ago](https://wordpress.org/support/topic/error-when-trying-file-manager/)
 * I get an error that says “Invalid Backend Response. Data is not JSON”.
 * Can you help me please?
 * Thank you,
 * Jeff Small
    [jsmall@linux25.com](https://wordpress.org/support/topic/error-when-trying-file-manager/jsmall@linux25.com?output_format=md)
 * [https://wordpress.org/plugins/file-manager/](https://wordpress.org/plugins/file-manager/)

Viewing 5 replies - 1 through 5 (of 5 total)

 *  Plugin Contributor [Aftabul Islam](https://wordpress.org/support/users/aihimel/)
 * (@aihimel)
 * [10 years, 3 months ago](https://wordpress.org/support/topic/error-when-trying-file-manager/#post-7120371)
 * Hello Jeff,
 * Please check your file permission. It should be 755.
 * Thanks
    Aftabul Islam
 *  [viiix](https://wordpress.org/support/users/viiix/)
 * (@viiix)
 * [10 years, 3 months ago](https://wordpress.org/support/topic/error-when-trying-file-manager/#post-7120698)
 * I have the same problem, but not being that IT Lit I found my hosts permissions
   page for the site, but there are hundreds of permissions some set at 640,664 
   and one at 750.
    I have installed this plug in to help me delete a Gallery Plugin,
   which following an update has gone. When I download the plugin again it tells
   me the file still exists and to use FTP to remove the file first. FTP, that’s
   the other side of the world. So you write code like this to help people like 
   me, but I can’t get your plugin to even start.
 * Any help appreciated.
 *  [viiix](https://wordpress.org/support/users/viiix/)
 * (@viiix)
 * [10 years, 3 months ago](https://wordpress.org/support/topic/error-when-trying-file-manager/#post-7120707)
 * My problem is the same as Jeff’s. Your reply in that instance was to check the
   file permission and set it to 755. I opened the file permissions of the 123-Reg
   who Host the site, but the permissions list is endless, so I ask should I change
   them all to 755?
 * At the moment if I open file manager I get the same response as Jeff: Data is
   not JSON”
 * Do you want the site credentials or the host?
 * I am happy to provide either.
 * Regards
    Graham.
 *  Plugin Contributor [Aftabul Islam](https://wordpress.org/support/users/aihimel/)
 * (@aihimel)
 * [10 years, 3 months ago](https://wordpress.org/support/topic/error-when-trying-file-manager/#post-7120708)
 * Hi Graham/viiix,
 * Could you please tell me which version of PHP are you using?
 * Thanks
 *  [viiix](https://wordpress.org/support/users/viiix/)
 * (@viiix)
 * [10 years, 3 months ago](https://wordpress.org/support/topic/error-when-trying-file-manager/#post-7120721)
 * Aihimel,
    I have since spent some considerable time going through the help pages
   of 123 Reg and having found their File Manager for the my site. Going through
   all the files I got to understand what I was looking for. I have deleted the 
   old Nextgen Folder, which allowed the update to load. So I have resolved my initial
   problem. Thanks for taking the time to reply.
 * Of note the File Permission for File Manager is set at 755
 * I googled PHP to find Hypertext Preprocessor; which one am I using, I have no
   idea. I am a 61 yr old architect (and not the type who designs PC Platforms).
 * As my initial problem is now solved, I think we can close this thread.
    Thanks
   agian

Viewing 5 replies - 1 through 5 (of 5 total)

The topic ‘Error when trying File Manager’ is closed to new replies.

 * ![](https://s.w.org/plugins/geopattern-icon/file-manager_e5f2f9.svg)
 * [File Manager](https://wordpress.org/plugins/file-manager/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/file-manager/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/file-manager/)
 * [Active Topics](https://wordpress.org/support/plugin/file-manager/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/file-manager/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/file-manager/reviews/)

 * 5 replies
 * 3 participants
 * Last reply from: [viiix](https://wordpress.org/support/users/viiix/)
 * Last activity: [10 years, 3 months ago](https://wordpress.org/support/topic/error-when-trying-file-manager/#post-7120721)
 * Status: resolved