Log.Error(category, message)
    Generates an error message passed in the second argument and associates it with the category passed in the first argument.
static void Error(stringcategory, stringmessage);
Arguments
      - category(string)
 - The message category.
 - message(string)
 - The message to generate.
 
Example
      Log.Error("CustomCategory", "This is an error message");
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