Title: Error Invalid backend response. Data is not JSON.
Last modified: August 31, 2016

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# Error Invalid backend response. Data is not JSON.

 *  Resolved [Ivko](https://wordpress.org/support/users/ivko/)
 * (@ivko)
 * [10 years, 1 month ago](https://wordpress.org/support/topic/error-invalid-backend-response-data-is-not-json/)
 * On he first run I get the Error message:
 * Invalid backend response.
    Data is not JSON.
 * What is the reason for that and how can I fix it?
 * [https://wordpress.org/plugins/file-manager/](https://wordpress.org/plugins/file-manager/)

Viewing 15 replies - 1 through 15 (of 15 total)

 *  Plugin Contributor [Aftabul Islam](https://wordpress.org/support/users/aihimel/)
 * (@aihimel)
 * [10 years, 1 month ago](https://wordpress.org/support/topic/error-invalid-backend-response-data-is-not-json/#post-7192341)
 * Hello Ivko,
 * Please check your file permission.
    It should be 0755.
 * Thanks
    Aftabul Islam
 *  [Christina Garofalo](https://wordpress.org/support/users/cold-iron-chef/)
 * (@cold-iron-chef)
 * [10 years ago](https://wordpress.org/support/topic/error-invalid-backend-response-data-is-not-json/#post-7192579)
 * How / Where do you change file permissions?
 *  [thefruitfly](https://wordpress.org/support/users/thefruitfly/)
 * (@thefruitfly)
 * [10 years ago](https://wordpress.org/support/topic/error-invalid-backend-response-data-is-not-json/#post-7192580)
 * Well that didn’t work. So, if that’s all you’ve got to add for “help”, I’ll just
   find a new plugin.
 *  Plugin Contributor [Aftabul Islam](https://wordpress.org/support/users/aihimel/)
 * (@aihimel)
 * [10 years ago](https://wordpress.org/support/topic/error-invalid-backend-response-data-is-not-json/#post-7192581)
 * Hello all,
 * **[@cold](https://wordpress.org/support/users/cold/) Iron Chef**
    You log in 
   to your cPanel. Open cPanel’s file browser/manager. Select files/folders and 
   right click or use toolbar’s file permission manager and change file permissions
   their.
 * **[@thefruitfly](https://wordpress.org/support/users/thefruitfly/)**
    Sorry for
   the misunderstanding. I have checked all the pitfalls that I could find. Most
   of the time file permission is the main reason behind the problem. If it doesn’t
   work, then their might be some other issues. Such as conflicts with other plugins,
   themes etc. In these cases you have to be more specific and also need some debugging
   knowledge in Javascript and CSS.
 * You can also try our support ticket for your problem in our website.
 * Thanks
    Aftabul Islam
 *  [tkutscher](https://wordpress.org/support/users/tkutscher/)
 * (@tkutscher)
 * [10 years ago](https://wordpress.org/support/topic/error-invalid-backend-response-data-is-not-json/#post-7192582)
 * …same here: since its update from 2.2.2 to 2.2.3 this error occurs.
 * with 2.2.2 everything works with all other plugins installed.
    with 2.2.3, same
   plugins: “Error Invalid backend response. Data is not JSON.”
 * other specs:
    wordpress 4.4.2, ithemes security pro, backup buddy, ninja forms
   max_upload_size: 200m
 * thanks for your help.
 * cheers,
    tom
 *  Plugin Contributor [Aftabul Islam](https://wordpress.org/support/users/aihimel/)
 * (@aihimel)
 * [10 years ago](https://wordpress.org/support/topic/error-invalid-backend-response-data-is-not-json/#post-7192583)
 * **[@tkutscher](https://wordpress.org/support/users/tkutscher/)**
 * I have tested version 2.2.3 on several systems. It works fine on my side. Can
   you please open your firefox/chromium console and see if their is any Javascript/
   jQuery conflict.
 * Thanks
    Aftabul Islam
 *  [kaepora](https://wordpress.org/support/users/kaepora/)
 * (@kaepora)
 * [10 years ago](https://wordpress.org/support/topic/error-invalid-backend-response-data-is-not-json/#post-7192584)
 * Exactly the same problem, everything perfect, updated only this plugin 15 mins
   ago and now this error. Edit: See details below. Have tried deactivating, removing
   and reinstalling, same problem.
 * Chrome console shows this: `parsererror elfinder.full.js?ver=4.4.2:1248`
    Line
   1248 is: `console.log(status);`
 * AJAX response in Chrome -> Network -> Preview:
 *     ```
       Warning: include(jsalfjsdf.php): failed to open stream: No such file or directory in /home/somewebuser/public_html/wp-content/plugins/file-manager/file-manager.php on line 42
   
       Warning: include(jsalfjsdf.php): failed to open stream: No such file or directory in /home/somewebuser/public_html/wp-content/plugins/file-manager/file-manager.php on line 42
   
       Warning: include(): Failed opening 'jsalfjsdf.php' for inclusion (include_path='.:/usr/lib/php:/usr/local/lib/php') in /home/somewebuser/public_html/wp-content/plugins/file-manager/file-manager.php on line 42
   
       Warning: Cannot modify header information - headers already sent by (output started at /home/somewebuser/public_html/wp-content/plugins/file-manager/file-manager.php:42) in /home/somewebuser/public_html/wp-content/plugins/file-manager/elFinder/php/elFinderConnector.class.php on line 140
       {"cwd":{"isowner":false,"ts":1460461005,"mime":"directory","read":1,"write":1,"size":0,"hash":"l1_Lw","name":"public_html","csscls":"elfinder-navbar-root-local","volumeid":"l1_","locked":1,"dirs":1,"uiCmdMap":[],"disabled":["chmod"],"root":"l1_Lw"},"options":{"path":"public_html","url":"http:\/\/africamerchantcapital.co.uk\/","tmbUrl":"http:\/\/africamerchantcapital.co.uk\/.tmb\/","disabled":["chmod"],"separator":"\/","copyOverwrite":1,"uploadOverwrite":1,"uploadMaxSize":2147483647,"dispInlineRegex":"^(?:(?:image|text)|application\/x-shockwave-flash$)","jpgQuality":100,"archivers":{"create":["application\/x-tar","application\/x-gzip","application\/x-bzip2","application\/x-xz","application\/zip"],"extract":["application\/x-tar","application\/x-gzip","application\/x-bzip2","application\/x-xz","application\/zip"],"createext":{"application\/x-tar":"tar","application\/x-gzip":"tgz","application\/x-bzip2":"tbz","application\/x-xz":"xz","application\/zip":"zip"}},"uiCmdMap":[],"syncChkAsTs":1,"syncMinMs":10000},"files":[{"isowner":false,"ts":1460461005,"mime":"directory","read":1,"write":1,"size":0,"hash":"l1_Lw","name":"public_html","csscls":"elfinder-navbar-root-local","volumeid":"l1_","locked":1,"dirs":1,"uiCmdMap":[],"disabled":["chmod"]},{"isowner":false,"mime":"text\/x-php","ts":1459725036,"read":1,"write":1,"size":"3286","hash":"l1_d3AtY3Jvbi5waHA","name":"wp-cron.php","phash":"l1_Lw"},{"isowner":false,"mime":"text\/x-php","ts":1453720897,"read":1,"write":1,"size":"3548","hash":"l1_d3AtY29uZmlnLnBocA","name":"wp-config.php","phash":"l1_Lw"},{"isowner":false,"mime":"directory","ts":1455123137,"read":1,"write":1,"size":0,"hash":"l1_cGhwTXlBZG1pbg","name":"phpMyAdmin","phash":"l1_Lw","volumeid":"l1_","dirs":1},{"isowner":false,"mime":"text\/plain","ts":1459725036,"read":1,"write":1,"size":"19930","hash":"l1_bGljZW5zZS50eHQ","name":"license.txt","phash":"l1_Lw"},{"isowner":false,"mime":"directory","ts":1395225620,"read":1,"write":1,"size":0,"hash":"l1_Y2dpLWJpbg","name":"cgi-bin","phash":"l1_Lw","volumeid":"l1_"},{"isowner":false,"mime":"directory","ts":1459555201,"read":1,"write":1,"size":0,"hash":"l1_LnRtYg","name":".tmb","phash":"l1_Lw","volumeid":"l1_"},{"isowner":false,"mime":"directory","ts":1459725037,"read":1,"write":1,"size":0,"hash":"l1_d3AtaW5jbHVkZXM","name":"wp-includes","phash":"l1_Lw","volumeid":"l1_","dirs":1},{"isowner":false,"mime":"directory","ts":1459723673,"read":1,"write":1,"size":0,"hash":"l1_YWRtaW5pc3RyYXRvcg","name":"administrator","phash":"l1_Lw","volumeid":"l1_","dirs":1},{"isowner":false,"mime":"unknown","ts":1457993897,"read":1,"write":1,"size":"15","hash":"l1_LmZ0cHF1b3Rh","name":".ftpquota","phash":"l1_Lw"},{"isowner":false,"mime":"text\/x-php","ts":1459725037,"read":1,"write":1,"size":"3061","hash":"l1_eG1scnBjLnBocA","name":"xmlrpc.php","phash":"l1_Lw"},{"isowner":false,"mime":"text\/html","ts":1459725037,"read":1,"write":1,"size":"7360","hash":"l1_cmVhZG1lLmh0bWw","name":"readme.html","phash":"l1_Lw"},{"isowner":false,"mime":"text\/x-php","ts":1459725037,"read":1,"write":1,"size":"7887","hash":"l1_d3AtbWFpbC5waHA","name":"wp-mail.php","phash":"l1_Lw"},{"isowner":false,"mime":"directory","ts":1460461151,"read":1,"write":1,"size":0,"hash":"l1_d3AtYWRtaW4","name":"wp-admin","phash":"l1_Lw","volumeid":"l1_","dirs":1},{"isowner":false,"mime":"text\/x-php","ts":1396562184,"read":1,"write":1,"size":"2380","hash":"l1_d3AtbGlua3Mtb3BtbC5waHA","name":"wp-links-opml.php","phash":"l1_Lw"},{"isowner":false,"mime":"text\/x-php","ts":1396562183,"read":1,"write":1,"size":"418","hash":"l1_aW5kZXgucGhw","name":"index.php","phash":"l1_Lw"},{"isowner":false,"mime":"directory","ts":1396562185,"read":1,"write":1,"size":0,"hash":"l1_Y3NzM2ZpeA","name":"css3fix","phash":"l1_Lw","volumeid":"l1_"},{"isowner":false,"mime":"unknown","ts":1430048853,"read":1,"write":1,"size":"266","hash":"l1_Lmh0YWNjZXNz","name":".htaccess","phash":"l1_Lw"},{"isowner":false,"mime":"text\/x-php","ts":1396562184,"read":1,"write":1,"size":"271","hash":"l1_d3AtYmxvZy1oZWFkZXIucGhw","name":"wp-blog-header.php","phash":"l1_Lw"},{"isowner":false,"mime":"text\/x-php","ts":1459725037,"read":1,"write":1,"size":"3316","hash":"l1_d3AtbG9hZC5waHA","name":"wp-load.php","phash":"l1_Lw"},{"isowner":false,"mime":"directory","ts":1460461002,"read":1,"write":1,"size":0,"hash":"l1_d3AtY29udGVudA","name":"wp-content","phash":"l1_Lw","volumeid":"l1_","dirs":1},{"isowner":false,"mime":"unknown","ts":1455120848,"read":1,"write":1,"size":"798","hash":"l1_ZXJyb3JfbG9n","name":"error_log","phash":"l1_Lw"},{"isowner":false,"mime":"text\/x-php","ts":1459725037,"read":1,"write":1,"size":"33770","hash":"l1_d3AtbG9naW4ucGhw","name":"wp-login.php","phash":"l1_Lw"},{"isowner":false,"mime":"text\/x-php","ts":1459725037,"read":1,"write":1,"size":"1369","hash":"l1_d3AtY29tbWVudHMtcG9zdC5waHA","name":"wp-comments-post.php","phash":"l1_Lw"},{"isowner":false,"mime":"text\/x-php","ts":1459725037,"read":1,"write":1,"size":"28594","hash":"l1_d3Atc2lnbnVwLnBocA","name":"wp-signup.php","phash":"l1_Lw"},{"isowner":false,"mime":"text\/x-php","ts":1459725037,"read":1,"write":1,"size":"5035","hash":"l1_d3AtYWN0aXZhdGUucGhw","name":"wp-activate.php","phash":"l1_Lw"},{"isowner":false,"mime":"text\/x-php","ts":1459725037,"read":1,"write":1,"size":"13021","hash":"l1_d3Atc2V0dGluZ3MucGhw","name":"wp-settings.php","phash":"l1_Lw"},{"isowner":false,"mime":"text\/x-php","ts":1459725037,"read":1,"write":1,"size":"2853","hash":"l1_d3AtY29uZmlnLXNhbXBsZS5waHA","name":"wp-config-sample.php","phash":"l1_Lw"},{"isowner":false,"mime":"text\/x-php","ts":1455120922,"read":1,"write":1,"size":"54","hash":"l1_cGhwaW5mby5waHA","name":"phpinfo.php","phash":"l1_Lw"},{"isowner":false,"mime":"text\/x-php","ts":1459725037,"read":1,"write":1,"size":"4035","hash":"l1_d3AtdHJhY2tiYWNrLnBocA","name":"wp-trackback.php","phash":"l1_Lw"}],"api":"2.0","uplMaxSize":"32M","uplMaxFile":"20","netDrivers":[],"debug":{"connector":"php","phpver":"5.4.45","time":0.0272150039673,"memory":"17217Kb \/ 17167Kb \/ 128M","upload":"","volumes":[{"id":"l1_","name":"localfilesystem","mimeDetect":"internal","imgLib":"gd"}],"mountErrors":[]}}
       ```
   
 *  [kaepora](https://wordpress.org/support/users/kaepora/)
 * (@kaepora)
 * [10 years ago](https://wordpress.org/support/topic/error-invalid-backend-response-data-is-not-json/#post-7192585)
 * <deleted>
 *  Plugin Contributor [Aftabul Islam](https://wordpress.org/support/users/aihimel/)
 * (@aihimel)
 * [10 years ago](https://wordpress.org/support/topic/error-invalid-backend-response-data-is-not-json/#post-7192586)
 * **[@kaepora](https://wordpress.org/support/users/kaepora/)**
 * Version 2.2.4 has been just released. It should fix the issue. Please update 
   an check if it works.
 * Thanks
    Aftabul Islam
 *  [tkutscher](https://wordpress.org/support/users/tkutscher/)
 * (@tkutscher)
 * [10 years ago](https://wordpress.org/support/topic/error-invalid-backend-response-data-is-not-json/#post-7192587)
 * works for me!
    thank you so much 🙂
 *  [kaepora](https://wordpress.org/support/users/kaepora/)
 * (@kaepora)
 * [10 years ago](https://wordpress.org/support/topic/error-invalid-backend-response-data-is-not-json/#post-7192588)
 * Excellent, thanks Aftabul, great response time.
 *  Plugin Contributor [Aftabul Islam](https://wordpress.org/support/users/aihimel/)
 * (@aihimel)
 * [10 years ago](https://wordpress.org/support/topic/error-invalid-backend-response-data-is-not-json/#post-7192589)
 * Thanks everyone. Let me know if you have some other issue with the plugins.
 * Thanks
    Aftabul Islam
 *  Plugin Contributor [Aftabul Islam](https://wordpress.org/support/users/aihimel/)
 * (@aihimel)
 * [10 years ago](https://wordpress.org/support/topic/error-invalid-backend-response-data-is-not-json/#post-7192590)
 * I am closing this issue.
 * Thanks
 *  [butchershopdustin](https://wordpress.org/support/users/butchershopdustin/)
 * (@butchershopdustin)
 * [9 years, 6 months ago](https://wordpress.org/support/topic/error-invalid-backend-response-data-is-not-json/#post-8359417)
 * I have this problem on the server json error but not locally
 * Which directory are you setting permissions on? I updated it on wp-content/uploads
   and also a sub directory in it but no luck . My one admin user only has those
   folders listed under his file manager folders
 * I bought this plugin but it’s not working 🙁
 * Thanks for any help
 *  [butchershopdustin](https://wordpress.org/support/users/butchershopdustin/)
 * (@butchershopdustin)
 * [9 years, 6 months ago](https://wordpress.org/support/topic/error-invalid-backend-response-data-is-not-json/#post-8359587)
 * I opened a new issue- [https://wordpress.org/support/topic/invalid-backend-response-json-error/](https://wordpress.org/support/topic/invalid-backend-response-json-error/).
   Please disregard my previous comment ( I could not find a way to delete it )

Viewing 15 replies - 1 through 15 (of 15 total)

The topic ‘Error Invalid backend response. Data is not JSON.’ is closed to new replies.

 * ![](https://s.w.org/plugins/geopattern-icon/file-manager_e5f2f9.svg)
 * [File Manager](https://wordpress.org/plugins/file-manager/)
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 * 15 replies
 * 7 participants
 * Last reply from: [butchershopdustin](https://wordpress.org/support/users/butchershopdustin/)
 * Last activity: [9 years, 6 months ago](https://wordpress.org/support/topic/error-invalid-backend-response-data-is-not-json/#post-8359587)
 * Status: resolved