You're trying to use an object variable to which a value has not been
assigned, or the value is null:
To duplicate it, do this:
object a;
Console.WriteLine(a.ToString());
the same with
object a = null;
Console.WriteLine(a.ToString());
This can also happen if you assign a value to an object variable from
another object variable that has a null value:
object a = null;
object b = a;
Console.WriteLine(b.ToString());
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