log日志报错：

10:01:44 Base directory lib/purifier/standalone/HTMLPurifier/DefinitionCache/Serializer does not exist,
                    please create or change using %Cache.SerializerPath in lib/purifier/purifier.class.php on line 15280 when visiting  wadmin.php?m=file&f=upload&objectType=source&objectID=default_default
请问一下怎么解决