Attribute Error in Inverse_Beta_Decay Notebook

[EmmaTintinger]

Error:
AttributeError: nu_e_bar

Location:
Inverse_Beta_Decay: cell [3]

Error trace:

AttributeError Traceback (most recent call last)
Input In [3], in <cell line: 8>()
6 enu = np.linspace(0., 200., 101) * u.MeV
8 for ibd, style, lab in zip([InvBetaPar(), InvBetaTab()],
9 ['-', '.'],
10 ['Parametric (Eq. 25)', 'Table 1']):
---> 11 xs = ibd.cross_section(Flavor.nu_e_bar, enu)
12 lep = ibd.mean_lepton_energy(Flavor.nu_e_bar, enu)
13 axes[0][0].plot(enu, xs, style, label=lab)

File ~/opt/anaconda3/lib/python3.9/enum.py:429, in EnumMeta.getattr(cls, name)
427 return cls.member_map[name]
428 except KeyError:
--> 429 raise AttributeError(name) from None

AttributeError: nu_e_bar