I messed up, but I fixed it

I just realized that the event of ConfigFileManager needs a method
that only accepts an Exception type parameter

CLI/Program.cs

@@ -61,10 +61,15 @@ class Program
 		return 0;
 	}
 
-	static void ErrorOccured(Exception e, string errorName = "Error")
+	static void ErrorOccured(Exception e, string errorName)
 	{
 		Console.WriteLine($"{errorName}: {e}\nMore details:\n{e.ToString()}");
 	}
+
+	static void ErrorOccured(Exception e)
+	{
+		Console.WriteLine($"Unexpected error: {e}\nMore details:\n{e.ToString()}");
+	}
 	
 	static void HelpMessage()
 	{