Title: Fatal error installing plugins
Last modified: August 19, 2016

---

# Fatal error installing plugins

 *  [nmgarnett](https://wordpress.org/support/users/nmgarnett/)
 * (@nmgarnett)
 * [17 years, 4 months ago](https://wordpress.org/support/topic/fatal-error-installing-plugins/)
 * Hi
    I’ve tried installing 2 plugins today, both times I get this message: Fatal
   error: Cannot redeclare class pclzip in /home/sites/nickgarnett.com/public_html/
   wp-admin/includes/class-pclzip.php on line 171 I’ve also unzipped plugin and 
   FTP’d and got same result. Plugins are breadcrumbs from Yoast.com and redirection
   Any help greatly appreciated Nick Garnett

Viewing 8 replies - 1 through 8 (of 8 total)

 *  [Samuel B](https://wordpress.org/support/users/samboll/)
 * (@samboll)
 * [17 years, 4 months ago](https://wordpress.org/support/topic/fatal-error-installing-plugins/#post-982507)
 * [http://wordpress.org/support/topic/230535?replies=2](http://wordpress.org/support/topic/230535?replies=2)
 * [http://wordpress.org/support/topic/228134?replies=7](http://wordpress.org/support/topic/228134?replies=7)
 *  Thread Starter [nmgarnett](https://wordpress.org/support/users/nmgarnett/)
 * (@nmgarnett)
 * [17 years, 4 months ago](https://wordpress.org/support/topic/fatal-error-installing-plugins/#post-982517)
 * Thanks Samboll…
 *  [aafc](https://wordpress.org/support/users/aafc/)
 * (@aafc)
 * [17 years, 1 month ago](https://wordpress.org/support/topic/fatal-error-installing-plugins/#post-982733)
 * I activated the Theme Switcher and received a fatal error and now cannot get 
   my site back up
    This is the message I am getting:
 * Fatal error: Cannot redeclare ts_set_theme_cookie() (previously declared in /
   home/omislack/public_html/wp-content/plugins/theme-switcher/theme-switcher.php:
   31) in /home/omislack/public_html/wp-content/plugins/theme-switcher-reloaded/
   theme-switcher-reloaded.php on line 27
 * Can anyone help please
 *  [whooami](https://wordpress.org/support/users/whooami/)
 * (@whooami)
 * [17 years, 1 month ago](https://wordpress.org/support/topic/fatal-error-installing-plugins/#post-982734)
 * you have 2 plugins using the same function. **Look at the error**.
 * plugins/**theme-switcher-reloaded**/theme-switcher-reloaded.php
 * plugins/**theme-switcher**/theme-switcher.php
 * Use your ftp client, and delete one of those plugins.
 *  [amazingvictoriafalls](https://wordpress.org/support/users/amazingvictoriafalls/)
 * (@amazingvictoriafalls)
 * [17 years ago](https://wordpress.org/support/topic/fatal-error-installing-plugins/#post-982743)
 * l was trying to install a new widget then as l was uploading the website crashed
   and this is what comes out
 * Fatal error: Call to undefined function register_sidebar_widget() in /home/.lilyput/
   amazingvictoriafalls/amazingvictoriafalls.com/wp-content/plugins/anime-dropdown-
   widget/anime-dropdown-widget.php on line 117
 *  [iogd](https://wordpress.org/support/users/iogd/)
 * (@iogd)
 * [16 years, 9 months ago](https://wordpress.org/support/topic/fatal-error-installing-plugins/#post-982768)
 * I am having trouble installing a business-directory. I am getting this error 
   message:
 * Fatal error: Call to undefined function: wp_get_current_user() in /home/sites/
   mysite/public_html/home/wp-includes/capabilities.php on line 920
 * Any ideas?
 *  [iogd](https://wordpress.org/support/users/iogd/)
 * (@iogd)
 * [16 years, 9 months ago](https://wordpress.org/support/topic/fatal-error-installing-plugins/#post-982769)
 * Fatal error: Call to undefined function: wp_get_current_user() in /home/sites/
   mysite.com/public_html/home/wp-includes/capabilities.php on line 920
 *  [Corrinda Campbell](https://wordpress.org/support/users/corrinda/)
 * (@corrinda)
 * [16 years, 8 months ago](https://wordpress.org/support/topic/fatal-error-installing-plugins/#post-982782)
 * I installed wp-security scan, wp backup and theme test drive. The last one was
   security scan and got the same fatal error. I couldn’t the website to display
   or get to the WP interface. I used an ftp client and deleted the 3 new plugins
   and could get to the interface and the site came back as well.

Viewing 8 replies - 1 through 8 (of 8 total)

The topic ‘Fatal error installing plugins’ is closed to new replies.

## Tags

 * [fatal error](https://wordpress.org/support/topic-tag/fatal-error/)
 * [Yoast](https://wordpress.org/support/topic-tag/yoast/)

 * In: [Fixing WordPress](https://wordpress.org/support/forum/how-to-and-troubleshooting/)
 * 8 replies
 * 7 participants
 * Last reply from: [Corrinda Campbell](https://wordpress.org/support/users/corrinda/)
 * Last activity: [16 years, 8 months ago](https://wordpress.org/support/topic/fatal-error-installing-plugins/#post-982782)
 * Status: not resolved

## Topics

### Topics with no replies

### Non-support topics

### Resolved topics

### Unresolved topics

### All topics