According to git example:
$objectMask = new \SoftLayer\ObjectMask();
$objectMask->updates;
$objectMask->assignedUser;
$objectMask->attachedHardware->datacenter;
$client->setObjectMask($objectMask);
The following exception is displayed:
Fatal error: Class 'SoftLayer\ObjectMask' not found in ...
It works fine doing the following change:
$objectMask = new \SoftLayer\Common\ObjectMask();