Title: Theme Switcher header issue Last modified: August 18, 2016 --- # Theme Switcher header issue * [PaulaO](https://wordpress.org/support/users/holyroller/) * (@holyroller) * [21 years, 2 months ago](https://wordpress.org/support/topic/theme-switcher-header-issue/) * I’ve tried several ways of using the theme switcher, but I keep getting the same error. * Warning: Cannot modify header information – headers already sent by (output started at /home/.milkyheater/poffutt/paulaoffutt.com/blog/index.php:3) in /home/.milkyheater/ poffutt/paulaoffutt.com/blog/wp-content/plugins/theme-switcher.php on line 37 * Warning: Cannot modify header information – headers already sent by (output started at /home/.milkyheater/poffutt/paulaoffutt.com/blog/index.php:3) in /home/.milkyheater/ poffutt/paulaoffutt.com/blog/wp-content/plugins/theme-switcher.php on line 39 * My default is Gila and I used my insomnia last night to get about seven themes ready to go with a click but I get errors. * I *think* the line# changes. I also tried the one that’s in french but got different php errors. * I just now reinstalled the plugin and put the code mentioned in the instructions in my sidebar. Got the above mentioned errors. * {{{ Themes: ?php wp_theme_switcher(); ? }}} (took out the li part so it would show here with no problems) * Changed the code to be the one mentioned in another thread, the one that is default in a lot of themes lately, but got the same errors. * ` * * Most plugins I’ve gotten to work with little to no tweaking. But it seems all the really useful ones are the hardest. Damn that guy Murphy! Viewing 14 replies - 1 through 14 (of 14 total) * [dawg](https://wordpress.org/support/users/dawg/) * (@dawg) * [21 years, 2 months ago](https://wordpress.org/support/topic/theme-switcher-header-issue/#post-175774) * #1 you are using style switcher not theme switcher and you have tried to implement it in the header by doc type. Add the code you have above to the side bar * ` * * Thread Starter [PaulaO](https://wordpress.org/support/users/holyroller/) * (@holyroller) * [21 years, 2 months ago](https://wordpress.org/support/topic/theme-switcher-header-issue/#post-175777) * It is in the sidebar. * I didn’t think I had uploaded the style switcher but I checked and it was there and on. * So, turned it off and now I get another error. By putting in line breaks, I have narrowed it down to the (spaced added on purpose). The error is a Parse error: parse error, unexpected $ in (blah blah sidebar.php) line 87 * Thread Starter [PaulaO](https://wordpress.org/support/users/holyroller/) * (@holyroller) * [21 years, 2 months ago](https://wordpress.org/support/topic/theme-switcher-header-issue/#post-175780) * Me again. I uploaded the original side bar, after switching to Batavia. It has less bells and whistles than my Gila theme which is full of my crap. * I didn’t change the code any that was originally in the sidebar, which has the‘ if function exists…’ part already in place. * Reloaded page. The parse error is gone but the original error is back. * It is in the sidebar and the style switcher is still off. * I guess I’ll force my few visitors to like whatever theme I’m in the mood for. heh heh * [Kafkaesqui](https://wordpress.org/support/users/kafkaesqui/) * (@kafkaesqui) * [21 years, 2 months ago](https://wordpress.org/support/topic/theme-switcher-header-issue/#post-175789) * [http://codex.wordpress.org/Answers-Trouble_Shooting#Headers_already_sent](http://codex.wordpress.org/Answers-Trouble_Shooting#Headers_already_sent) * Thread Starter [PaulaO](https://wordpress.org/support/users/holyroller/) * (@holyroller) * [21 years, 2 months ago](https://wordpress.org/support/topic/theme-switcher-header-issue/#post-175797) * Okay, looked at the sidebar. If the ’.”\n” ; foreach( $theme_names as $theme_name) { * this is beyond my grasp of understanding. I am a Southern Blond Female. 😀 * [goldie29](https://wordpress.org/support/users/goldie29/) * (@goldie29) * [21 years, 2 months ago](https://wordpress.org/support/topic/theme-switcher-header-issue/#post-175802) * This error message may be caused by whitespace either before the beginning of the theme-switcher.php script, or after the end of the script (eg, either before the “” at the end). Whitespace is any text that is not visible, such as blank spaces, line feeds, carriage returns, tabs, or any other non-printable character. When you open theme-switcher.php in notepad, make sure that the cursor cannot go beyond the “?>” at the end of the script. If it can, remove any extra space. * Moderator [James Huff](https://wordpress.org/support/users/macmanx/) * (@macmanx) * [21 years, 2 months ago](https://wordpress.org/support/topic/theme-switcher-header-issue/#post-175804) * The problem isn’t in the sidebar, it’s in index.php on line 3. * “output started at /home/.milkyheater/poffutt/paulaoffutt.com/blog/index.php: 3” * Thread Starter [PaulaO](https://wordpress.org/support/users/holyroller/) * (@holyroller) * [21 years, 2 months ago](https://wordpress.org/support/topic/theme-switcher-header-issue/#post-175858) * I just checked the line 3 of the ‘main’ index.php (vs the index.php in Gila or any other theme) and it is the end of referrer-karma: check_referrer(); ?> * So I took out all the r-k lines, made sure that no blank spaces were before the first at the end of your theme-switcher.php plug-in and your main index.php file! =D Viewing 14 replies - 1 through 14 (of 14 total) The topic ‘Theme Switcher header issue’ is closed to new replies. * 14 replies * 6 participants * Last reply from: [cenas_girl13](https://wordpress.org/support/users/cenas_girl13/) * Last activity: [20 years, 2 months ago](https://wordpress.org/support/topic/theme-switcher-header-issue/#post-176694) * Status: not resolved ## Topics ### Topics with no replies ### Non-support topics ### Resolved topics ### Unresolved topics ### All topics