---------------------------------------------------------------------------
RuntimeError                              Traceback (most recent call last)
/home/baba/ResearchBrief/code/fem_images/p2_firedrakeplot.py in <module>()
     13 u_viz = Function(Vviz)
     14 
---> 15 prolong(u, u_viz)

<decorator-gen-404> in prolong(coarse, fine)

/home/baba/Progs/firedrake/local/lib/python2.7/site-packages/firedrake/utils.pyc in wrapper(f, *args, **kwargs)
     60         opts["type_check"] = safe
     61         try:
---> 62             return f(*args, **kwargs)
     63         finally:
     64             opts["type_check"] = check

/home/baba/Progs/firedrake/local/lib/python2.7/site-packages/firedrake/mg/interface.pyc in prolong(coarse, fine)
     18     hierarchy, lvl = utils.get_level(cfs)
     19     if hierarchy is None:
---> 20         raise RuntimeError("Coarse function not from hierarchy")
     21     fhierarchy, flvl = utils.get_level(fine.function_space())
     22     if flvl != lvl + 1:

RuntimeError: Coarse function not from hierarchy