Title: [Plugin: iSlidex] Error Last modified: August 19, 2016 --- # [Plugin: iSlidex] Error * [prudat](https://wordpress.org/support/users/prudat/) * (@prudat) * [16 years ago](https://wordpress.org/support/topic/plugin-islidex-error/) * I love the plugin and having a conflict I was hoping someone could help me resolve. Whenever I activate the plugin I get the following across the top of my site * **Warning: Cannot modify header information – headers already sent by (output started at /home/content/g/o/r/gorilladesigns/html/gorilladesigns/wp-content/ plugins/islidex/islidex.php:1170) in /home/content/g/o/r/gorilladesigns/html/ gorilladesigns/wp-content/themes/headway-162/library/core/core-head.php on line 437** * Warning: Cannot modify header information – headers already sent by (output started at /home/content/g/o/r/gorilladesigns/html/gorilladesigns/wp-content/plugins/ islidex/islidex.php:1170) in /home/content/g/o/r/gorilladesigns/html/gorilladesigns/ wp-content/themes/headway-162/library/core/core-head.php on line 441 * It looks like it is a conflict of some type with my theme: Headway. * I disabled all other plugins. * I also get this error when I try and disable islidex in my plugin admin area. * **Warning: Cannot modify header information – headers already sent by (output started at /home/content/g/o/r/gorilladesigns/html/gorilladesigns/wp-content/ plugins/islidex/islidex.php:1170) in /home/content/g/o/r/gorilladesigns/html/ gorilladesigns/wp-includes/pluggable.php on line 868** * Thanks for your help. * [http://wordpress.org/extend/plugins/islidex/](http://wordpress.org/extend/plugins/islidex/) Viewing 15 replies - 1 through 15 (of 15 total) * [Duke](https://wordpress.org/support/users/dukessa/) * (@dukessa) * [16 years ago](https://wordpress.org/support/topic/plugin-islidex-error/#post-1485955) * Hello prudat, as we say also in our plugin description, it is not possible to have the perfect plugin, because themes are all different, installed plugins too, therefore there might always be a conflict or issue at some point. * Could you please post here what the code is at: themes/headway-162/library/core/ core-head.php on line 437 themes/headway-162/library/core/core-head.php on line 441 * Also, could you please update your WordPress to the latest version 2.9.2 and tell me if you still get the error when you disable iSlidex? * [brubrant](https://wordpress.org/support/users/brubrant/) * (@brubrant) * [16 years ago](https://wordpress.org/support/topic/plugin-islidex-error/#post-1486175) * A have similar problem, but i’m using Hybrid Framework and WordPress 2.9.2 * The error occours at same line in islidex.php and pluggable.php * Thanks for the plguin, it is all that I was looking for. * [Duke](https://wordpress.org/support/users/dukessa/) * (@dukessa) * [16 years ago](https://wordpress.org/support/topic/plugin-islidex-error/#post-1486176) * Because we can’t reproduce your issue, I’d need you to paste here what code is at the lines where you get the error. * This kind of errors occur because you are using themes that influence normal WordPress behaviour and it’s really hard sometimes to find a plugin solution for all the different themes out there. Have you already tried to use the alternative shortcodes `[islidex_altern]`, `[islidex_altern2]` and `[islidex_thesis]` ? * [Justin Tadlock](https://wordpress.org/support/users/greenshady/) * (@greenshady) * [16 years ago](https://wordpress.org/support/topic/plugin-islidex-error/#post-1486210) * The problem you all are experiencing is likely because the `islidex.php` file has no closing `?>` at the end of the file or the file has additional whitespace after a closing `?>` tag. * Please read the FAQ: [How do I solve the headers already sent warning?](http://codex.wordpress.org/FAQ_Troubleshooting#How_do_I_solve_the_Headers_already_sent_warning_problem.3F) * > This kind of errors occur because you are using themes that influence normal > WordPress behaviour and it’s really hard sometimes to find a plugin solution > for all the different themes out there. * This is quite clearly a PHP issue with the iSlidex plugin. The error message says it all. It has nothing to do with what theme someone is using. * [Duke](https://wordpress.org/support/users/dukessa/) * (@dukessa) * [16 years ago](https://wordpress.org/support/topic/plugin-islidex-error/#post-1486213) * Greenshady, thank you for pointing that out. It surprisingly worked fine for most people, including us, even without ?> but this was definitely a major oversight in v.1.8 v.1.8.1 is now out to correct that issue. * And yes sometimes it does depend on the theme too, just like for other plugins, this one too might get broken by it or break it. * [danlehman](https://wordpress.org/support/users/danlehman/) * (@danlehman) * [16 years ago](https://wordpress.org/support/topic/plugin-islidex-error/#post-1486218) * Hello, I am actually having the same issue as listed originally in this post. * Here is my error: * > Warning: Cannot modify header information – headers already sent by (output > started at C:\xampp\htdocs\wordpress\wp-content\plugins\islidex\islidex.php: > 1170) in C:\xampp\htdocs\wordpress\wp-includes\pluggable.php on line 868 * Line 1170 on islidex.php only shows this: `