[Paraview] error using new reader

[Brad King]

John Biddiscombe (CSCS) wrote:
>> This is a bug related to the change of a reader from subclassing off 
>> of vtkSource to subclassing off of a different vtkAlgorithm subclass.  
>> I've add it to my to-do list to fix.
> 
> Thanks, I've changed back to using the sources instead of algorithms and 
> it is behaving a bit more predictably now.

I've now committed the fix for your original error message.

-Brad