One option is to clone the class in your own project.

Experts may have better solution.

Cheers

On Fri, Aug 5, 2016 at 10:10 AM, Carlo.Allocca <carlo.allocca@open.ac.uk> wrote:
Hi Ted, 

Thanks for the promptly answer. 
It is not yet clear to me what I should do. 

How to fix it? 

Many thanks, 
Carlo

On 5 Aug 2016, at 17:58, Ted Yu <yuzhihong@gmail.com> wrote:

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