     ///   - file: File of the caller.
     ///   - function: Function of the caller.
     ///   - line: Line of the caller.
+    ///   - error: Error of the caller.
     ///   - context: Additional meta data.
     ///   - completion: The block to call when log entries sent.
     func warning(

            file: file,
            function: function,
            line: line,
            error: nil,
            context: context,
            completion: completion
        )

        file: String = #fileID,
        function: String = #function,
        line: Int = #line,
        error: Error? = nil,
        context: [String: CustomStringConvertible] = [:],
        completion: (() -> Void)? = nil
    ) {
