wp_force_remove_style’ not found

You have an action, but not the valid callback for your action.

For example,

You have somewhere following line:

add_action( 'some_action', 'wp_force_remove_style' );

But not have “wp_force_remove_style” function defined.

You have to have a function as following:

function wp_force_remove_style() {
    // Do you stuff.
}