Title: Growing error log – Last modified: August 21, 2016 --- # Growing error log – * [The Hack Repair Guy](https://wordpress.org/support/users/tvcnet/) * (@tvcnet) * [12 years, 2 months ago](https://wordpress.org/support/topic/growing-error-log/) * Just wondering if that looks at all familiar to you. I have a growing error log relating to Quick Cache and not clear how I can fix the apparent repeating error. Ideas? * ++++ * `[11-Apr-2014 22:51:20 UTC] PHP Fatal error: Uncaught exception 'Exception' with message 'Unable to cache already-compressed output. Please use`mod_deflate`w/ Apache; or use`zlib.output_compression`in your`php.ini`file. Quick Cache is NOT compatible with`ob_gzhandler()` and others like this.’ in /home/account/public_html/ wp-content/advanced-cache.php:185 Stack trace: * #0 [internal function]: quick_cache\advanced_cache->output_buffer_callback_handler(‘????????????? o?…’, 5) #1 /home/account/public_html/wp-includes/functions.php(2773): ob_end_flush()# 2 [internal function]: wp_ob_end_flush_all(”) #3 /home/account/public_html/wp- includes/plugin.php(429): call_user_func_array(‘wp_ob_end_flush…’, Array) #4 / home/account/public_html/wp-includes/load.php(580): do_action(‘shutdown’) #5 [ internal function]: shutdown_action_hook() #6 {main} thrown in /home/account/ public_html/wp-content/advanced-cache.php on line 185 ` * [https://wordpress.org/plugins/quick-cache/](https://wordpress.org/plugins/quick-cache/) Viewing 3 replies - 1 through 3 (of 3 total) * Plugin Author [Raam Dev](https://wordpress.org/support/users/raamdev/) * (@raamdev) * [12 years, 1 month ago](https://wordpress.org/support/topic/growing-error-log/#post-4800664) * That means that you’re running a plugin that is conflicting with Quick Cache, likely something that uses `ob_gzhandler()`. Please see [this list of incompatible plugins](https://github.com/WebSharks/Quick-Cache/wiki/Troubleshooting#list-of-incompatible-plugins). If you’re not using any of those, I recommend deactivating plugins one-by-one until you find the one that’s generating these error messages. * If you do find a new incompatible plugin, I’d love to know what it is so that I can update the list. * [pabloblanco](https://wordpress.org/support/users/pabloblanco/) * (@pabloblanco) * [12 years, 1 month ago](https://wordpress.org/support/topic/growing-error-log/#post-4800687) * Hello, * In my case, the problem occurs with the XML Sitemap Generator plugin, version 4.0.4 * This plugin, in the sitemap-core.php file contains the following line of code( line 1570): `if ($ pack) $ packed = @ ob_start ('ob_gzhandler');` * The google webmaster tool reports a http 500 error when trying to access the sitemap * Plugin Author [Raam Dev](https://wordpress.org/support/users/raamdev/) * (@raamdev) * [12 years ago](https://wordpress.org/support/topic/growing-error-log/#post-4800698) * The next release of Quick Cache includes better handling for scenarios where another plugin is using `ob_start()`. If you’re interested in testing a beta release of Quick Cache before the next version comes out, please sign-up to be a beta tester [here](http://www.websharks-inc.com/r/quick-cache-beta-testers-list/). Viewing 3 replies - 1 through 3 (of 3 total) The topic ‘Growing error log –’ is closed to new replies. * ![](https://s.w.org/plugins/geopattern-icon/quick-cache_efefef.svg) * [Quick Cache (Speed Without Compromise)](https://wordpress.org/plugins/quick-cache/) * [Frequently Asked Questions](https://wordpress.org/plugins/quick-cache/#faq) * [Support Threads](https://wordpress.org/support/plugin/quick-cache/) * [Active Topics](https://wordpress.org/support/plugin/quick-cache/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/quick-cache/unresolved/) * [Reviews](https://wordpress.org/support/plugin/quick-cache/reviews/) * 3 replies * 3 participants * Last reply from: [Raam Dev](https://wordpress.org/support/users/raamdev/) * Last activity: [12 years ago](https://wordpress.org/support/topic/growing-error-log/#post-4800698) * Status: not resolved