It looks like you're using NetLogo Web in standalone mode.
If the above error is being caused by an unimplemented primitive, we recommend a quick visit to
NetLogoWeb.org
to see if the primitive has been implemented in the most up-to-date version.
find all usages of selected text (when in NetLogo Code editor)
ctrl;
comment/uncomment a line of code (when in NetLogo Code editor)
Click setup to create a model. Click go to start playing! You can choose to change the fisher type and restrict fishing for a certain number of days. You can also experiment with the number of fishers.