Please follow the guidelines Read before posting: How do I get my question answered?
and format all code by encapsulating it with ```.
Also remove all code node required to reproduce the error. It would be Good if you could reproduce the problem with the built in meshes.
As you are trying to take a function from a Mixed space and assign it to a non Mixed problem, you can use
u,p=w.split(deepcopy=True)
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