Problems with on-error?

Howdy,

I've run into what looks like a problems with the on-error directive
in Petal 2.17.  Given the following input (straight from the Petal documentation):


  <p petal:on-error="string:Cannot access object/method!!">
  $object/method

  </p>

Petal produced the following output:

  string:Cannot access
object/method!!

It looks as if Petal is treating the argument to on-error
as a simple string rather than as an expression, so the string: modifier shows
up in the text.

  $ perl -MPetal -e 'print $Petal::VERSION, "\n"'
  2.17


-- Lars