Woocommerce 2.1.5 error

  • I’m getting the following message:

    Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, ‘woocommerce_admin_css’ was given in

    any idea how to fix it?

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  • The same problem appears after installing plugin: WooCommerce Table Rate Shipping Version 2.5.1. I’m use WooCommerce Version 2.1.7.

    Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'woocommerce_admin_css' was given in /home1/raven/public_html/shop/wp-includes/plugin.php on line 470

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