Issue with the influence line drawing

[cdavy44]

Hi, I feel like there is a problem with the influence line generation. No matter what code I write, I can't draw it outside of the first span. I have copied the code from the documentation just changing the last line create error messages...
Here is my code :
import pycba as cba
import numpy as np
import matplotlib.pyplot as plt
EI = 180000
beam_string = "E30R30H30R30E"
(L, EI, R, eType) = cba.parse_beam_string(beam_string)
ils = cba.InfluenceLines(L, EI, R, eType)
ils.create_ils(step=0.05)
ils.plot_il(40.0, "M")

And here is the error message : IndexError: index 0 is out of bounds for axis 0 with size 0.

Maybe there is an error with my code but I can't find it...