Title: Using Captcha
Last modified: August 20, 2016

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# Using Captcha

 *  [shaffiahmed](https://wordpress.org/support/users/shaffiahmed/)
 * (@shaffiahmed)
 * [13 years, 3 months ago](https://wordpress.org/support/topic/using-captcha/)
 * Hi
 * I am trying to install a plugin called Captcha and it gives me an error as shown
   below.
 * `Warning: call_user_func_array() [function.call-user-func-array]: First argument
   is expected to be a valid callback, '' was given in /home/root/public_html/gifts/
   wp-includes/plugin.php on line 173`
 * Can you please help. If you dont then do you know of any captcha plugin that 
   works well with WooCommerce plugin
 * [http://wordpress.org/extend/plugins/woocommerce/](http://wordpress.org/extend/plugins/woocommerce/)

Viewing 2 replies - 1 through 2 (of 2 total)

 *  Thread Starter [shaffiahmed](https://wordpress.org/support/users/shaffiahmed/)
 * (@shaffiahmed)
 * [13 years, 3 months ago](https://wordpress.org/support/topic/using-captcha/#post-3306205)
 * Maybe it is worth mentioning that I am getting this error message when I am post
   a Review on a product. The error message is displayed at the top of the Review
   Popup
 *  [bheadrick](https://wordpress.org/support/users/bheadrick/)
 * (@bheadrick)
 * [13 years, 3 months ago](https://wordpress.org/support/topic/using-captcha/#post-3306275)
 * link to site?
    usually, that sort of error message would give you an idea of 
   what file / plugin originated the error

Viewing 2 replies - 1 through 2 (of 2 total)

The topic ‘Using Captcha’ is closed to new replies.

 * ![](https://ps.w.org/woocommerce/assets/icon.svg?rev=3234504)
 * [WooCommerce](https://wordpress.org/plugins/woocommerce/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/woocommerce/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/woocommerce/)
 * [Active Topics](https://wordpress.org/support/plugin/woocommerce/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/woocommerce/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/woocommerce/reviews/)

## Tags

 * [captcha plugin](https://wordpress.org/support/topic-tag/captcha-plugin/)

 * 2 replies
 * 2 participants
 * Last reply from: [bheadrick](https://wordpress.org/support/users/bheadrick/)
 * Last activity: [13 years, 3 months ago](https://wordpress.org/support/topic/using-captcha/#post-3306275)
 * Status: not resolved