problem with my first trap

[beus@bunsen.cs.byu.edu]

Trying a simple use of a Mac trap gives this error.
Can anyone help?

? (#_sysbeep 1)
> Error: Can't find TRAPS::_SYSBEEP in "ccl:interfaces;index;traps.idx".
>        Consider (REINDEX-INTERFACES) or look in "ccl:library;interfaces.lisp"
> While executing: CCL::FIND-INTERFACE-ENTRY
> Type Command-/ to continue, Command-. to abort.
> If continued: Ignore the error.
See the Restarts  menu item for further choices.

The manual indicates only the need to use the #_ read macro.
What's up?