If you'd like to use logging, please download Analog from here:

https://github.com/jbroadway/analog

Extract it to this folder. Result should be a directory structure like this:

./wblib/3rdparty/Analog/
                        wblib.init.inc.php
                        Analog.php
                        ChromePhp.php
                        Analog/
                              ...more files here...