Deepcopy problem

Hello,

I'm using your tool. On windows it does not show any problem, but on macOS, the lines creating deepcopy(model) returned the error:

"TypeError: cannot pickle 'SwigPyObject' object"

I am running the same version of python, modules, and solvers. The only issue appear when using macOS. 
Then I replaced those lines with:

model.copy()

And now it works again. 

Best