Title: Error: Ajax controller returned empty JSON
Last modified: November 14, 2016

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# Error: Ajax controller returned empty JSON

 *  Resolved [Kunzilla](https://wordpress.org/support/users/kunzilla/)
 * (@kunzilla)
 * [9 years, 6 months ago](https://wordpress.org/support/topic/error-ajax-controller-returned-empty-json/)
 * Hi,
 * we just get a new error from Loco 2. It says “Error: Ajax controller returned
   empty JSON” when we hit the Sync-Button.
 * What can we do? We using the latest version of Loco and WordPress.

Viewing 7 replies - 1 through 7 (of 7 total)

 *  Thread Starter [Kunzilla](https://wordpress.org/support/users/kunzilla/)
 * (@kunzilla)
 * [9 years, 6 months ago](https://wordpress.org/support/topic/error-ajax-controller-returned-empty-json/#post-8434593)
 * We want to download the POT File and the phrases are incomplete.
 *  Plugin Author [Tim W](https://wordpress.org/support/users/timwhitlock/)
 * (@timwhitlock)
 * [9 years, 6 months ago](https://wordpress.org/support/topic/error-ajax-controller-returned-empty-json/#post-8434716)
 * A pot file is supposed to have no translations. It is a template.
 * Regarding your sync error – I need something to go on. Please check your logs
   for errors.
 *  Thread Starter [Kunzilla](https://wordpress.org/support/users/kunzilla/)
 * (@kunzilla)
 * [9 years, 6 months ago](https://wordpress.org/support/topic/error-ajax-controller-returned-empty-json/#post-8438109)
 * Hi Tim,
 * please tell me, how can we log the relevant procedures that you can help us? 
   At the last issue, we can’t see any error in the wordpress logfiles, so how we
   can do that?
 *  Plugin Author [Tim W](https://wordpress.org/support/users/timwhitlock/)
 * (@timwhitlock)
 * [9 years, 6 months ago](https://wordpress.org/support/topic/error-ajax-controller-returned-empty-json/#post-8438537)
 * [https://codex.wordpress.org/Debugging_in_WordPress](https://codex.wordpress.org/Debugging_in_WordPress)
 *  Thread Starter [Kunzilla](https://wordpress.org/support/users/kunzilla/)
 * (@kunzilla)
 * [9 years, 6 months ago](https://wordpress.org/support/topic/error-ajax-controller-returned-empty-json/#post-8442177)
 * Hi Tim,
    we just set the logging-settings many times and try everything, but 
   there is nothing related to loco in the logfiles. There are some warnings (undefined
   index etc), but nothing with loco.
 * Now, what can we do?
 *  Plugin Author [Tim W](https://wordpress.org/support/users/timwhitlock/)
 * (@timwhitlock)
 * [9 years, 6 months ago](https://wordpress.org/support/topic/error-ajax-controller-returned-empty-json/#post-8443117)
 * Undefined index notices suggest badly written plugins/theme. I’d disable whatever
   is raising these notices and see if the problem goes away.
 * If you can provide exact steps to reproduce the problem I’ll investigate, but
   I can’t enter into a guessing game without any evidence of what is going wrong.
 *  Thread Starter [Kunzilla](https://wordpress.org/support/users/kunzilla/)
 * (@kunzilla)
 * [9 years, 6 months ago](https://wordpress.org/support/topic/error-ajax-controller-returned-empty-json/#post-8463973)
 * Hey Tim,
 * FYI: Since the last update of loco, it works well again.
 * We don’t change anything, the problem was loco i think.

Viewing 7 replies - 1 through 7 (of 7 total)

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 * 7 replies
 * 2 participants
 * Last reply from: [Kunzilla](https://wordpress.org/support/users/kunzilla/)
 * Last activity: [9 years, 6 months ago](https://wordpress.org/support/topic/error-ajax-controller-returned-empty-json/#post-8463973)
 * Status: resolved