It looks like you are using an old version of Inform, or maybe have installed the old version of Glulx Entry Points that is posted on the I7 extensions website. Whatever the cause, you need to be using the most up-to-date version (v9) of the built-in Glulx Entry Points extension.
As a side comment, I am not sure what the reasoning is for including old versions of built-in extensions in the extensions library. The version of Glulx Entry Points that is up there dates to 2008…
Idd. That extension is older on the extensions list on the site than the one bundled with Inform. I found it rather annoying, when I installed the Quoted Box extension for Glulx. Had to reinstall Inform.