Title: Error message Last modified: August 20, 2016 --- # Error message * Resolved [FaithJava](https://wordpress.org/support/users/faithjava/) * (@faithjava) * [13 years, 6 months ago](https://wordpress.org/support/topic/error-message-144/) * Hello there! * I follow all the instruction but after installing the plugin and click on ‘Activate’ button, it takes you to an error message page ‘The plugin does not have a valid header.’ and it wont work properly. Any solution to this? * Cheers * [http://wordpress.org/extend/plugins/schemeable-sliding-panel/](http://wordpress.org/extend/plugins/schemeable-sliding-panel/) Viewing 15 replies - 1 through 15 (of 31 total) 1 [2](https://wordpress.org/support/topic/error-message-144/page/2/?output_format=md) [3](https://wordpress.org/support/topic/error-message-144/page/3/?output_format=md) [→](https://wordpress.org/support/topic/error-message-144/page/2/?output_format=md) * Plugin Author [kdmurthy](https://wordpress.org/support/users/kdmurthy/) * (@kdmurthy) * [13 years, 6 months ago](https://wordpress.org/support/topic/error-message-144/#post-3193726) * What is the WordPress version? * Thread Starter [FaithJava](https://wordpress.org/support/users/faithjava/) * (@faithjava) * [13 years, 6 months ago](https://wordpress.org/support/topic/error-message-144/#post-3193727) * Thanks for your quick response, the wordpress version is 3.4.2 * Plugin Author [kdmurthy](https://wordpress.org/support/users/kdmurthy/) * (@kdmurthy) * [13 years, 6 months ago](https://wordpress.org/support/topic/error-message-144/#post-3193730) * It looks like a conflict with other plugins. (We tested with clean WordPress 3.4.2 install and it works well). Can you disable any other plugins you have and check it out? * Thread Starter [FaithJava](https://wordpress.org/support/users/faithjava/) * (@faithjava) * [13 years, 6 months ago](https://wordpress.org/support/topic/error-message-144/#post-3193738) * Thats exactly what I did, after I thought it might be plugin conflict, I decide to use clean WordPress 3.4.2, to my surprise still having the same error * Thread Starter [FaithJava](https://wordpress.org/support/users/faithjava/) * (@faithjava) * [13 years, 6 months ago](https://wordpress.org/support/topic/error-message-144/#post-3193744) * What do you think I should do now? After that error message appears, I refresh by typing ‘[http://localhost/wordpress2/wp-admin/plugins.php’](http://localhost/wordpress2/wp-admin/plugins.php’); on my URL and reactivate it, it activated but not working properly, I guess the CSS is having issue. Please let me know what to do. * Thanks * Plugin Author [kdmurthy](https://wordpress.org/support/users/kdmurthy/) * (@kdmurthy) * [13 years, 6 months ago](https://wordpress.org/support/topic/error-message-144/#post-3193753) * This plugin uses lambda functions and in couple of sites that is causing an issue( PHP Version error). You can try the version available in the SVN trunk, that fixes this issue. * If you still have problems, try enabling debug in wp-config.php and post the log. * Thread Starter [FaithJava](https://wordpress.org/support/users/faithjava/) * (@faithjava) * [13 years, 6 months ago](https://wordpress.org/support/topic/error-message-144/#post-3193756) * can you please send me the link of the available version in SVN trunk? * Plugin Author [kdmurthy](https://wordpress.org/support/users/kdmurthy/) * (@kdmurthy) * [13 years, 6 months ago](https://wordpress.org/support/topic/error-message-144/#post-3193760) * You can use this command to access the code: * ``` svn co http://plugins.svn.wordpress.org/schemeable-sliding-panel/trunk schemeable-sliding-panel ``` * Thread Starter [FaithJava](https://wordpress.org/support/users/faithjava/) * (@faithjava) * [13 years, 6 months ago](https://wordpress.org/support/topic/error-message-144/#post-3193762) * thanks man, will do that right away * Thread Starter [FaithJava](https://wordpress.org/support/users/faithjava/) * (@faithjava) * [13 years, 6 months ago](https://wordpress.org/support/topic/error-message-144/#post-3193772) * Have use the version in SVN trunk as you recommend, is activated but not working, the arrangement of the layers are not in order, when I try to preview it, is not coming up properly. * Plugin Author [kdmurthy](https://wordpress.org/support/users/kdmurthy/) * (@kdmurthy) * [13 years, 6 months ago](https://wordpress.org/support/topic/error-message-144/#post-3193773) * Can you enable debug and get me the log? * Details here: [http://codex.wordpress.org/Debugging_in_WordPress](http://codex.wordpress.org/Debugging_in_WordPress) * Thread Starter [FaithJava](https://wordpress.org/support/users/faithjava/) * (@faithjava) * [13 years, 6 months ago](https://wordpress.org/support/topic/error-message-144/#post-3193775) * ok, thanks * Thread Starter [FaithJava](https://wordpress.org/support/users/faithjava/) * (@faithjava) * [13 years, 6 months ago](https://wordpress.org/support/topic/error-message-144/#post-3193779) * Hhave set WP_DEBUG in wp-config.php to true, but can’t find the error log * Plugin Author [kdmurthy](https://wordpress.org/support/users/kdmurthy/) * (@kdmurthy) * [13 years, 6 months ago](https://wordpress.org/support/topic/error-message-144/#post-3193786) * Add the following to your wp-config.php (copied from the above link). And activate the plugin. The debug output will be written in wp-content/debug.log file. * ``` // Enable WP_DEBUG mode define('WP_DEBUG', true); // Enable Debug logging to the /wp-content/debug.log file define('WP_DEBUG_LOG', true); // Disable display of errors and warnings define('WP_DEBUG_DISPLAY', false); @ini_set('display_errors',0); // Use dev versions of core JS and CSS files (only needed if you are modifying these core files) define('SCRIPT_DEBUG', true); ``` * Thread Starter [FaithJava](https://wordpress.org/support/users/faithjava/) * (@faithjava) * [13 years, 6 months ago](https://wordpress.org/support/topic/error-message-144/#post-3193790) * ok Viewing 15 replies - 1 through 15 (of 31 total) 1 [2](https://wordpress.org/support/topic/error-message-144/page/2/?output_format=md) [3](https://wordpress.org/support/topic/error-message-144/page/3/?output_format=md) [→](https://wordpress.org/support/topic/error-message-144/page/2/?output_format=md) The topic ‘Error message’ is closed to new replies. * ![](https://s.w.org/plugins/geopattern-icon/schemeable-sliding-panel_007f00.svg) * [Schemeable Sliding Panel](https://wordpress.org/plugins/schemeable-sliding-panel/) * [Frequently Asked Questions](https://wordpress.org/plugins/schemeable-sliding-panel/#faq) * [Support Threads](https://wordpress.org/support/plugin/schemeable-sliding-panel/) * [Active Topics](https://wordpress.org/support/plugin/schemeable-sliding-panel/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/schemeable-sliding-panel/unresolved/) * [Reviews](https://wordpress.org/support/plugin/schemeable-sliding-panel/reviews/) * 31 replies * 3 participants * Last reply from: [FaithJava](https://wordpress.org/support/users/faithjava/) * Last activity: [13 years, 6 months ago](https://wordpress.org/support/topic/error-message-144/page/3/#post-3193862) * Status: resolved