Groovy Compiler and GroovyConsole work in a very different way

My code

class Book
{
def name;
Book(){}
}

boo = new Book();
boo.setName("pcdinh");
println boo.getName();

GroovyConsole accepts without any compaints and print out: pcdinh
Screenshot: http://img206.imageshack.us/my.php?image=groovyconsolehi0.png

But Groovy compiler denied to run it
Screenshot: http://img221.imageshack.us/my.php?image=groovycompilermt9.png

The same case happens if I remove the declaration of the class Book so my code will become:

boo = new Book();
boo.setName("pcdinh");
println boo.getName();

GroovyConsole works well and does not generate any error but it is not the case with Groovy Compiler:

Screenshot: http://img351.imageshack.us/my.php?image=groovycompiler2hy5.png