Description:
------------
Note, I'm stuck with the latest CVS version and bug may have been fixed in the RC1.




Reproduce code:
---------------
try{
$img->setImageVirtualPixelMethod(imagick::VIRTUALPIXELMETHOD_TILE);
}

catch(ImagickException $e) {
echo("'Imagick Error: ' , {$e->getMessage()}");
}
returns: "Undefined exception".

This shows all the virtualpixels constants are good.
exec("identify -list virtualpixel", $listarray);

And the "-virtual-pixel tile" works here:
exec("convert noise.png -virtual-pixel tile  -blur 0x5 -normalize IM_noise_blur.png", $error, $msg);