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Make sure use flush_rewrite_rules() to flush out everything. Add it to your hooks when you activate/deactivate your plugin ------------------------------------------ 'register_activation_hook( FILE, array( 'Your_Hook', 'on_activation' ) ); register_deactivation_hook( FILE, array( 'Your_Hook', 'on_deactivation' ) ); register_uninstall_hook( FILE, array( 'Your_Hook', 'on_uninstall' ) );'
