making the most of Groovy in Action 2nd edition

Hi all,

After a bit of extensive bashing, I found some time to re-read Groovy in
Action 2nd edition.
I've downloaded the source code from the publisher also and am wondering
how to make the most from the book provided I run Groovy 4.0.20/Mac 12.7.4
Running groovysh from the console is fine, but it doesn't always print the
examples
going into the groovy book source
 GroovyInAction % groovy alltests.groovy
org.codehaus.groovy.control.MultipleCompilationErrorsException: startup
failed:
/Users/xxxx/GroovyInAction/alltests.groovy: 2: unable to resolve class
AntBuilder
 @ line 2, column 15.
       def ant = new AntBuilder()
                 ^

1 error
Thanks!