Hook throws PHP warnings

[yumyo]

The code example throws the following error:

PHP Warning:  call_user_func_array() expects parameter 1 to be a valid callback, 
function 'prefix_do_wampum_popup' not found or invalid function name in /app/wp-includes/class-wp-hook.php on line 288

The same applies if using any other naming.

[JiveDig]

prefix_do_wampum_popup is just an example usage. You can't call that callback without also creating the function with the same name.

[yumyo]

Not sure I am following @JiveDig,
I am using the complete example from the readme:

add_action( 'wampum_popups', 'prefix_do_wampum_popup' );

function prefix_do_wampum_popup() {

	// Bail if not a single post
	if ( ! is_singular('post') ) {
		return;
	}

	$content = '// Some HTML';

	$args = array(
		'type'	=> 'timed',
		'style'	=> 'slideup',
	);
	wampum_popup( $content, $args );

}

To which function are you referring to?

[JiveDig]

If you use that exact code it should work. That’s exactly how we use it. Do you have that code or a modified version?