Title: error activating plugin Last modified: August 18, 2016 --- # error activating plugin * [gaebe](https://wordpress.org/support/users/gaebe/) * (@gaebe) * [20 years, 4 months ago](https://wordpress.org/support/topic/error-activating-plugin/) * I have upgraded to WP2.01 and when i try to activate or deactivate plugin, I get this: * Fatal error: Call to undefined function: check_admin_referer() in C:\Inetpub\ wwwroot\mt\vowelsystem\wp-admin\plugins.php on line 5 * Can someone tell me how to fix it? Thanks. Viewing 10 replies - 16 through 25 (of 25 total) [←](https://wordpress.org/support/topic/error-activating-plugin/?output_format=md) [1](https://wordpress.org/support/topic/error-activating-plugin/?output_format=md) 2 * [vkaryl](https://wordpress.org/support/users/vkaryl/) * (@vkaryl) * [20 years, 4 months ago](https://wordpress.org/support/topic/error-activating-plugin/page/2/#post-331724) * gaebe: so all your plugins are deactivated right now? Or some are activated now? * [superjux](https://wordpress.org/support/users/superjux/) * (@superjux) * [20 years, 4 months ago](https://wordpress.org/support/topic/error-activating-plugin/page/2/#post-331726) * vkaryl, I deactivated every single plugin and tried one at a time and I still get the errors. 🙁 * Thread Starter [gaebe](https://wordpress.org/support/users/gaebe/) * (@gaebe) * [20 years, 4 months ago](https://wordpress.org/support/topic/error-activating-plugin/page/2/#post-331727) * Yes all my plugins are deactivated now. * [vkaryl](https://wordpress.org/support/users/vkaryl/) * (@vkaryl) * [20 years, 4 months ago](https://wordpress.org/support/topic/error-activating-plugin/page/2/#post-331729) * And you can’t activate even one of the “default” included ones without an error? * Thread Starter [gaebe](https://wordpress.org/support/users/gaebe/) * (@gaebe) * [20 years, 4 months ago](https://wordpress.org/support/topic/error-activating-plugin/page/2/#post-331736) * None of them… =( * [vkaryl](https://wordpress.org/support/users/vkaryl/) * (@vkaryl) * [20 years, 4 months ago](https://wordpress.org/support/topic/error-activating-plugin/page/2/#post-331808) * gaebe: I think you might at this point download a fresh distro, uncompress, and reupload the files in case something got corrupted in the upload. * I don’t have any other bright ideas, sorry…. * [johannmon](https://wordpress.org/support/users/johannmon/) * (@johannmon) * [20 years, 4 months ago](https://wordpress.org/support/topic/error-activating-plugin/page/2/#post-331886) * I am getting the same error with 2.01: * Fatal error: Call to undefined function: check_admin_referer() … on line 5 * Have tried deleting wp-admin and uploading it, doesn’t work. CAnnot activate any plugins. I am using only the ones that came with WordPress. * Thread Starter [gaebe](https://wordpress.org/support/users/gaebe/) * (@gaebe) * [20 years, 3 months ago](https://wordpress.org/support/topic/error-activating-plugin/page/2/#post-332170) * Does anyone know where’s the problem? * [cnc137](https://wordpress.org/support/users/cnc137/) * (@cnc137) * [20 years, 3 months ago](https://wordpress.org/support/topic/error-activating-plugin/page/2/#post-332237) * I am getting this same problem now too. I upgraded from WP 2.0 to WP 2.0.1 and was able to activate all of my plugins after that, but today I tried deactivating one of them and received the following error message: * Fatal error: Call to undefined function: check_admin_referer() in /home/dream/ public_html/www137/wp-admin/plugins.php on line 5 * Now I cannot activate or deactivate any of my plugins, not even “Hello Dolly”. * I looked on [http://trac.wordpress.org](http://trac.wordpress.org) and didn’t see any mention of this problem either. Does anyone have any idea why the script wouldn’t be able to locate the definition of the “check_admin_referer()” function? I looked at the source code for “plugins.php” and it is including “admin.php” and “admin.php” includes “wp-admin/admin-functions.php” which includes the “check_admin_referer()” function as far as I can tell. * This is very weird, since I was able to activate all my plugins the other day, but now they magically won’t activate or deactivate. 🙁 * cnc137. * [cnc137](https://wordpress.org/support/users/cnc137/) * (@cnc137) * [20 years, 3 months ago](https://wordpress.org/support/topic/error-activating-plugin/page/2/#post-332238) * Well, I just downloaded WP 2.0.1 again and re-uploaded all the file and I am now able to activate and deactivate my plugins again. That was weird and I have no clue why I would’ve been able to activate my plugins the other night and then all of a sudden it stopped working today. Oh well, it is working again now so I am happy. * cnc137. Viewing 10 replies - 16 through 25 (of 25 total) [←](https://wordpress.org/support/topic/error-activating-plugin/?output_format=md) [1](https://wordpress.org/support/topic/error-activating-plugin/?output_format=md) 2 The topic ‘error activating plugin’ is closed to new replies. ## Tags * [api](https://wordpress.org/support/topic-tag/api/) * In: [Fixing WordPress](https://wordpress.org/support/forum/how-to-and-troubleshooting/) * 25 replies * 5 participants * Last reply from: [cnc137](https://wordpress.org/support/users/cnc137/) * Last activity: [20 years, 3 months ago](https://wordpress.org/support/topic/error-activating-plugin/page/2/#post-332238) * Status: not resolved ## Topics ### Topics with no replies ### Non-support topics ### Resolved topics ### Unresolved topics ### All topics