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
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