Looks like another person had the same problem as me. The solution to the issue can be found here: http://lucene.472066.n3.nabble.com/Solr-3-1-ICU-filters-error-loading-class-td2835323.html
Perhaps the person in charge of the documentation could add apache-solr -analysis-extras-X.Y.jar as a requirement. -- *Tomek Rej** *| Developer *roamz** **23 Foster Street* *Surry Hills NSW 2010 Australia*** *M* +61 431 829 593 *E* tomek.rej <tomek....@roamz.com>@roamz.com <tomek....@roamz.com>* ***