Debug warnings

Plugin gives the following warnings when debugging is turned on

Notice: Undefined index: switch_for_tablets in /wp-content/plugins/mobile-smart/mobile-smart.php on line 850
Notice: has_cap was called with an argument that is deprecated since version 2.0! Usage of user levels by plugins and themes is deprecated. Use roles and capabilities instead. in //wp-includes/functions.php on line 3193

https://ww.wp.xz.cn/plugins/mobile-smart/