> PHP Catchable fatal error: Argument 1 passed to SMW\Subobject::__construct() must be an instance of Title, null given,
See  for the analysis of the issue.
> I am trying with SMW 2.3.1 (on MW 1.26.2). rebuildData.php
Is expected to work as described by the documentation (otherwise our tests would fail and you would see a red status alert on ).