Title: Error message Last modified: August 21, 2016 --- # Error message * Resolved [kernow99](https://wordpress.org/support/users/kernow99/) * (@kernow99) * [12 years, 6 months ago](https://wordpress.org/support/topic/error-message-268/) * Hello, * Thank you for your plugin which does exactly what I need – mostly! I have a private site with only the default Post category, General. I find that it is necessary to check the Category box under Notification Service on the user profile page when subscribing or unsubscribing, otherwise the following error message is thrown up:- * Warning: implode() [function.implode]: Invalid arguments passed in /home/hevvacou/ public_html/members-blog/wp-content/plugins/new-post-notification/npn_plugin. php on line 146 * Warning: implode() [function.implode]: Invalid arguments passed in /home/hevvacou/ public_html/members-blog/wp-content/plugins/new-post-notification/npn_plugin. php on line 149 * Warning: Cannot modify header information – headers already sent by (output started at /home/hevvacou/public_html/members-blog/wp-content/plugins/new-post-notification/ npn_plugin.php:146) in /home/hevvacou/public_html/members-blog/wp-includes/pluggable. php on line 899 * I am concerned that this will faze some of my users! * Any advice would be appreciated, thanks. * [http://wordpress.org/plugins/new-post-notification/](http://wordpress.org/plugins/new-post-notification/) Viewing 10 replies - 1 through 10 (of 10 total) * Plugin Author [kilozwo](https://wordpress.org/support/users/kilozwo/) * (@kilozwo) * [12 years, 6 months ago](https://wordpress.org/support/topic/error-message-268/#post-4354534) * Hi kernow99, * thanks for reporting the bug. It should be fixed with version 1.0.4 with I published just seconds ago. * Kind regards… * Thread Starter [kernow99](https://wordpress.org/support/users/kernow99/) * (@kernow99) * [12 years, 6 months ago](https://wordpress.org/support/topic/error-message-268/#post-4354535) * Hi Kilozwo, * Thanks for your response. The problem has been partly fixed, but the following message is still thrown up if the Category box is unchecked when the Update button is clicked. * Warning: implode(): Invalid arguments passed in /home/hevvacou/public_html/members- blog/wp-content/plugins/new-post-notification/npn_plugin.php on line 148 * Warning: Cannot modify header information – headers already sent by (output started at /home/[xxxxxxxx]/public_html/members-blog/wp-content/plugins/new-post-notification/ npn_plugin.php:148) in /home/hevvacou/public_html/members-blog/wp-includes/pluggable. php on line 899 * I wonder if this is because I only have the single default category, General? * Thanks for your time, and for a very useful plugin! * [kjprice](https://wordpress.org/support/users/kjprice/) * (@kjprice) * [12 years, 6 months ago](https://wordpress.org/support/topic/error-message-268/#post-4354541) * This should fix it. I’m not sure if it is “WordPressy” enough though. * if(isset($_POST[‘npn_mailnotify_category’])){ update_usermeta( $user_id, ‘npn_mailnotify_category’, implode(‘,’,$_POST[‘npn_mailnotify_category’])); } * [argent41](https://wordpress.org/support/users/argent41/) * (@argent41) * [12 years, 6 months ago](https://wordpress.org/support/topic/error-message-268/#post-4354545) * Hi Kilozwo, Great plugin worthy of my donation, but, I find that version 1.04 did not completely fix the issue. When editing a user profile I still get the following errors and my private site customers are concerned that this presents a security risk. * Warning: implode() [function.implode]: Invalid arguments passed in /home/theterraces/ www/www/wp-content/plugins/new-post-notification/npn_plugin.php on line 148 * Warning: Cannot modify header information – headers already sent by (output started at /home/theterraces/www/www/wp-content/plugins/new-post-notification/npn_plugin. php:148) in /home/theterraces/www/www/wp-includes/pluggable.php on line 899 * [argent41](https://wordpress.org/support/users/argent41/) * (@argent41) * [12 years, 6 months ago](https://wordpress.org/support/topic/error-message-268/#post-4354549) * Very disappointing that after you took my donation, you can’t be bothered to reply to my support request or fix your plugin. * Moderator [Jan Dembowski](https://wordpress.org/support/users/jdembowski/) * (@jdembowski) * Forum Moderator and Brute Squad * [12 years, 6 months ago](https://wordpress.org/support/topic/error-message-268/#post-4354550) * **argent41** If you need assistance please start your own topic instead. This isn’t your topic. * [http://wordpress.org/support/plugin/new-post-notification#postform](http://wordpress.org/support/plugin/new-post-notification#postform) * Thread Starter [kernow99](https://wordpress.org/support/users/kernow99/) * (@kernow99) * [12 years, 5 months ago](https://wordpress.org/support/topic/error-message-268/#post-4354552) * Hi kjprice, Have tried inserting your code at various points in the plugin php file, but without success. However, thanks for the response! * Plugin Author [kilozwo](https://wordpress.org/support/users/kilozwo/) * (@kilozwo) * [12 years, 5 months ago](https://wordpress.org/support/topic/error-message-268/#post-4354553) * Just updated to v 1.0.5. I also included kjprice’s Code. Thanks for that, I didn’t notice that WP will not send a $_POST array when no checkbox is activated. * I didn’t get your error messages at all. Even if I unchecked all checkboxes. Could someone please report if this issue is now fixed or not? * Thanks. * Thread Starter [kernow99](https://wordpress.org/support/users/kernow99/) * (@kernow99) * [12 years, 5 months ago](https://wordpress.org/support/topic/error-message-268/#post-4354554) * Don’t know what I was doing wrong with the code, but v 1.0 5 is working perfectly, thank you! * Plugin Author [kilozwo](https://wordpress.org/support/users/kilozwo/) * (@kilozwo) * [12 years, 5 months ago](https://wordpress.org/support/topic/error-message-268/#post-4354555) * You had to replace line 148. Thanks for reporting! Viewing 10 replies - 1 through 10 (of 10 total) The topic ‘Error message’ is closed to new replies. * ![](https://s.w.org/plugins/geopattern-icon/new-post-notification.svg) * [New Post Notification](https://wordpress.org/plugins/new-post-notification/) * [Support Threads](https://wordpress.org/support/plugin/new-post-notification/) * [Active Topics](https://wordpress.org/support/plugin/new-post-notification/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/new-post-notification/unresolved/) * [Reviews](https://wordpress.org/support/plugin/new-post-notification/reviews/) * 10 replies * 5 participants * Last reply from: [kilozwo](https://wordpress.org/support/users/kilozwo/) * Last activity: [12 years, 5 months ago](https://wordpress.org/support/topic/error-message-268/#post-4354555) * Status: resolved