[plt-scheme] dr.scheme v207

Hello,

I am just starting to learn dr.scheme, but I cannot start the simply.scm code to follow the book and exercises. I loaded the "simply-teachpack.scm" to teachpack folder but whenever I try to execute the file I get the teachpack error message saying "not allowed in an expression context" I have no problems in executing other teachpacks in the teachpack folder. I will be very happy if you can help me solve this problem.
thanks in advance

Canan.
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