"errorOccured" is an English spelling mistake, but is the
name of the event, which cannot / should not be changed for
backwards compatibility reasons.

Spelling was boguously "corrected" in:

  commit 60a9b517
  Author: Takeshi Abe <tabe@fixedpoint.jp>
  Date:   Sat Dec 4 12:56:38 2010 +0900

      Replace all occured, occurance etc.

This was leading to impossibility of assigning a macro
to that event, since it was not appearing in this dialog.

Change-Id: Ib0373501cba8af8f4abb1c62faddf8d65c926a7e