[plt-scheme] (no subject)

Hi,

Just downloaded Dr. Scheme on my Imac G5 running Tiger 10.4.2. I have  
Language->Teaching Languages->Beginning Student selected.

This:

(boolean? #t)
(boolean? "Hello, world")
(not #f)
(not #t)
(not "Hello, World")

Is getting these results:

Welcome to DrScheme, version 299.400.
Language: Beginning Student.
true
false
true
false
not: expected either true or false; given "Hello, World"

And this:

(string #\h #\e #\l #\l #\o)

Is getting this result:

Welcome to DrScheme, version 299.400.
Language: Beginning Student.
string: name is not defined, not an argument, and not a primitive name

What have I done wrong?

David Arnold
College of the Redwoods
Mathematics Department
Eureka, CA 95501
(707) 476-4222
http://online.redwoods.edu/instruct/darnold/