[Python] I have encountered TypeError: float() argument must be a string or a real number, not...

I tried an example code from PyNomo.doc, copied the code for the specific nomogram to be generated, and it yielded a TypeError. How can I fix this?

from pynomo.nomographer import Nomographer
import numpy
const_A = 1.5
const_B = 0.36
const_C = 4.25
const_D = .134
const_E = 150
const_F = 0.15

def f1(x,v):
return const_A*numpy.sin(const_B*(-x+const_C*v**const_D))+ \
(v/const_E)/(-x+const_F+(v/200))**2

block_20_params={
'block_type':'type_5',
'u_tag':'resolution',
'wd_tag':'illum',
'width':10.0,
'height':13.0,
'u_func':lambda u:numpy.log10(u),
'u_values':[1.0,2.0,3.0,4.0,5.0,
6.0,7.0,8.0,9.0,
10.0,20.0,30.0,40.0],
'u_text_format':r"$%3.0f$ ",
'v_func':f1,
'v_values':[10.0,20.0,30.0,50.0,100.0]

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