System.NullReferenceException: 'Object reference not set to an instance of an object.'

[Hex Tech Engineer]

Heres the code halp plz

public static void checkssettings()
{
RegistryKey rk = Registry.LocalMachine;
RegistryKey key = rk.OpenSubKey(@"SOFTWARE\Kosmik\Settings\");
if (key != null)
{

key.SetValue("Theme", "Dark");
theme = (key.GetValue("Theme")).ToString();


}
else
{

//key.SetValue("Theme", null);
key.SetValue("Theme", "Dark");

}
}


Name Value Type
▶ $exception {"Object reference not set to an instance of an object."} System.NullReferenceException

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