Missing argument 3 for wp_register_sidebar_widget()

I installed the Deprecated Calls plugin and it’s telling me to change register_sidebar_widget() and register_widget_control(), essentially add wp_ first.

I did but I’m getting Missing argument 3 for wp_register_sidebar_widget() and wp_register_widget_control()

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Is it ok if I put the default none for the 3rd arg?

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