the problems exp37

[liangaomng]

dear sir,

Thanks for this codes. It shows this error.

In the exp37, Number of control unknowns: 12288

Step = 1
Traceback (most recent call last):

b.AddDomainIntegrator(mfem.VectorDomainLFIntegrator(self.rhs_cf))

File "/mfem/_ser/lininteg.py", line 367, in init
self._ir=ir
NameError: name 'ir' is not defined. Did you mean: 'dir'?