What is and how to fix System.TypeInitializationException error?

Whenever a TypeInitializationException is thrown, check all initialization logic of the type you are referring to for the first time in the statement where the exception is thrown – in your case: Logger.

Initialization logic includes: the type’s static constructor (which – if I didn’t miss it – you do not have for Logger) and field initialization.

Field initialization is pretty much “uncritical” in Logger except for the following lines:

private static string s_bstCommonAppData = Path.Combine(s_commonAppData, "XXXX");
private static string s_bstUserDataDir = Path.Combine(s_bstCommonAppData, "UserData");
private static string s_commonAppData = Environment.GetFolderPath(Environment.SpecialFolder.CommonApplicationData);

s_commonAppData is null at the point where Path.Combine(s_commonAppData, "XXXX"); is called. As far as I’m concerned, these initializations happen in the exact order you wrote them – so put s_commonAppData up by at least two lines 😉

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