SED: energy bins problem

[Hend30]

Data Analysis Question

I am using fermipy to get the SED for some pulsars. Whenever I choose smaller energy bins "loge_bins_input = np.array([2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9,4])" I get (Prefactor include infinite value)