Trying to exec a cake shell fails...

Hello... I'm trying to use the "hello world" shell which is located at
E:\project\trunk\app\Console\Command\HelloShell.php.

Using the command window, "cake hello" works exactly as described...
However, every attempt I've made to execute this script from a cake
controller has failed. The controller code:

$out = $ret = null;
$ans = exec('cake hello 2>&1', $out, $ret);

returns the follow error message in $out and $ret has a value of 500!

array(
(int) 0 => '',
(int) 1 => 'Error: Shell class HelloShell could not be found.',
(int) 2 => '#0 E:\project\trunk\lib\Cake\Console
\ShellDispatcher.php(191): ShellDispatcher->_getShell('hello')',
(int) 3 => '#1 E:\project\trunk\lib\Cake\Console
\ShellDispatcher.php(69): ShellDispatcher->dispatch()',
(int) 4 => '#2 E:\project\trunk\app\Console\cake.php(33):
ShellDispatcher::run(Array)',
(int) 5 => '#3 {main}',
(int) 6 => ''
)

\app\Controller\MyController.php (line 125)


Any ideas would be greatly appreciated...

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