TWiki::AccessControlException
Exception used raise an access control violation.
$mode
- mode of access (view, change etc)
$user
- user object doing the accessing
$web
- web being accessed
$topic
- topic being accessed
$reason
- string reason for failure
All the above fields are accessible from the object in a catch clause
in the usual way e.g. $e->{web}
and $e->{reason}
Generate a summary string