Fixed problem with missing a message of the error

Befor:
<log><class>error</class><href>http://www.example.com/test.html</href></log>

After:
<log><class>error</class><msg>"NetworkError: 404 Not Found - http://www.example.com/pokus.png"</msg><href>http://www.example.com/test.html</href></log>