Title: Missing callback function – Can't update – Get warning message Last modified: September 1, 2016 --- # Missing callback function – Can't update – Get warning message * Resolved [mikisdad](https://wordpress.org/support/users/mikisdad/) * (@mikisdad) * [9 years, 9 months ago](https://wordpress.org/support/topic/missing-callback-function-cant-update-get-warning-message/) * I am running OSX El-Kapitan and Firefox browser. * I have a site at [http://linesandlight.net/](http://linesandlight.net/) * I logged in recently to update to WP 4.6 * I also wanted to update the Jetpack plugin from 4.1.1 to 4.2.1 * When I logged in and went to do the updates I received a line of dialogue: Warning: call_user_func_array() expects parameter 1 to be a vallid callback function “ wp_resource_hints” not found or invalid function name. * When I asked for further details I got: * /home/hawcroft/public-html/linesandlight.net/wp-includes/plugin.php on line 525 * Neither the Jetpack plugin or the WordPress app will update. I just get a spinning beachball and eventually I got a report from Wordfence: * Wordfence found the following new issues on “Lines & Light”. Alert generated at Friday 19th of August 2016 at 10:31:25 AM Critical Problems: * WordPress core file modified: readme.html * Unfortunately, the only backup of the site I have is from when I first set it up – I normally have auto backup turned on but somehow hadn’t done so with this site so although I can restore, it loses virtually all content since April. * I’m not IT smart [clearly] so if anyone can suggest a solution I can implement without having to start again, it would be great. * If I’m being an idiot and posting in the wrong place or asking a stupid question– please accept my apologies. I do try to fix things myself before yelling for help but most of it is beyond my knowledge or competence. Viewing 4 replies - 1 through 4 (of 4 total) * Moderator [t-p](https://wordpress.org/support/users/t-p/) * (@t-p) * [9 years, 9 months ago](https://wordpress.org/support/topic/missing-callback-function-cant-update-get-warning-message/#post-7680938) * Have you considered updating WP and plugins manually? * WordPress: Download a fresh copy of the WordPress .zip file to your computer, unzip it, and use that to copy up all files and folders **EXCEPT the wp-config. php file and the /wp-content/ directory.** You may need to delete the old wp- admin and wp-includes folders and files on your server before uploading the new ones. Please read the [Manual Update](http://codex.wordpress.org/Updating_WordPress#Manual_Update) directions first. * **Backup: If you haven’t already done, always backup everything (including your database) before doing any actions, just in case something really goes wrong. You can never have enough backups! ** * Plugins: [https://codex.wordpress.org/Managing_Plugins#Manual_Plugin_Installation](https://codex.wordpress.org/Managing_Plugins#Manual_Plugin_Installation) * Thread Starter [mikisdad](https://wordpress.org/support/users/mikisdad/) * (@mikisdad) * [9 years, 9 months ago](https://wordpress.org/support/topic/missing-callback-function-cant-update-get-warning-message/#post-7681091) * Tara, Thank you so much for your help. I had a little difficulty but your advice got me through and I now have my site both updated and back up and running smoothly. I have also made sure that I have a BACKUP – of everything. * I am really very grateful for your assistance – it’s a site I built for my wife so you’ve kept me out of the doghouse and I’ve also learned some things I hadn’t realised before. * Your response was very kind – thank you for taking the time and trouble to help. If there is anything that acknowledges your contribution of the member of the forum, I’m happy to give it – for now, YOU ROCK! * Moderator [t-p](https://wordpress.org/support/users/t-p/) * (@t-p) * [9 years, 9 months ago](https://wordpress.org/support/topic/missing-callback-function-cant-update-get-warning-message/#post-7681098) * you are welcome 🙂 * [debbietomkies](https://wordpress.org/support/users/debbietomkies/) * (@debbietomkies) * [9 years, 9 months ago](https://wordpress.org/support/topic/missing-callback-function-cant-update-get-warning-message/#post-7681236) * Just rescued a failed update thanks to your info. Thanks heaps! Viewing 4 replies - 1 through 4 (of 4 total) The topic ‘Missing callback function – Can't update – Get warning message’ is closed to new replies. ## Tags * [callback](https://wordpress.org/support/topic-tag/callback/) * In: [Fixing WordPress](https://wordpress.org/support/forum/how-to-and-troubleshooting/) * 4 replies * 3 participants * Last reply from: [debbietomkies](https://wordpress.org/support/users/debbietomkies/) * Last activity: [9 years, 9 months ago](https://wordpress.org/support/topic/missing-callback-function-cant-update-get-warning-message/#post-7681236) * Status: resolved ## Topics ### Topics with no replies ### Non-support topics ### Resolved topics ### Unresolved topics ### All topics