The type initializer for 'MyClass' threw an exception

Check the InnerException property of the TypeInitializationException; it is likely to contain information about the underlying problem, and exactly where it occurred.

This problem can be caused if a class tries to get value of a key in web.config or app.config which is not present there.

e.g.
The class has a static variable

private static string ClientID = System.Configuration.ConfigurationSettings.AppSettings["GoogleCalendarApplicationClientID"].ToString();

But the web.config doesn't contain the GoogleCalendarApplicationClientID key

The error will be thrown on any static function call or any class instance creation