Page Chapter 3. Module-Specific Settings, Page 28

Location on the page: 
near bottom
Error: 

if (!is_numeric($form_values['annotation_limit_per_node'])) {

Correction: 

if (!is_numeric($form_values['annotate_limit_per_node'])) {

Description of the Error: 

The form value annotation_limit_per_node doesn't exist, but annotate_limit_per_node does.