Page Chapter 10. The Form API, Page 180

Location on the page: 
top sentence
Error: 

Do not confuse type = '#value' and #value = 123.

Correction: 

Do not confuse '#type' => 'value' and '#value' => 123.

Description of the Error: 

The #type property is missing its #. The array => syntax should be used (instead of =) for setting key/value pairs. The value the #type property is being set to should not have a # preceding it.