[SOLVED] get_current_page was called incorrectly

You see the following error when you use Merlin Wizard with WooCommerce.

Notice : get_current_page was called incorrectly . 
Current page retrieval should be called on or after the `current_screen` hook. 
Please see Debugging in WordPress for more information. 
(This message was added in version 0.16.0.) in C:\xampp\htdocs\themes\wp-includes\functions.php on line

To solve the issue, remove the following code in class-merlin.php file.

do_action('admin_head');