Run error on XPS 15 running Python 3.7.4

[calmymail]

Bought new laptop and when I tried to run a code, got runtime errors which never existed on my desktop. File is attached
TBMP.py.txt

TBM-Plot> python.exe .\TBMplts.py
Working on Mach Number: 1.5
Working on Mach Number: 2.0
Working on Mach Number: 2.5
Working on Mach Number: 3.0
Working on Mach Number: 3.5
Working on Mach Number: 4.0
Working on Mach Number: 4.5
Working on Mach Number: 5.0
Working on Mach Number: 5.5
Working on Mach Number: 6.0
Working on Mach Number: 6.5
Working on Mach Number: 7.0
Working on Mach Number: 8.0
Working on Mach Number: inf
Traceback (most recent call last):
File ".\TBMplts.py", line 84, in
plot_max_line(gamma=gamma, color='k', linestyle='--')
File ".\TBMplts.py", line 41, in plot_max_line
theta_max[i], beta_max[i] = shocks.max_deflection(M[i], gamma)
File "C:\Users\Charles\Google Drive\Teaching\Codes\Projects_CAL\TBM-Plot\skaero\gasdynamics\shocks.py", line 62, in max_deflection
eq, mu, np.pi / 2, args=(M_1, gamma), disp=0)
File "C:\Users\Charles\AppData\Local\Programs\Python\Python37\lib\site-packages\scipy\optimize\optimize.py", line 1736, in fminbound
res = _minimize_scalar_bounded(func, (x1, x2), args, **options)
File "C:\Users\Charles\AppData\Local\Programs\Python\Python37\lib\site-packages\scipy\optimize\optimize.py", line 1870, in _minimize_scalar_bounded
if np.isnan(xf) or np.isnan(fx) or np.isnan(fu):
UnboundLocalError: local variable 'fu' referenced before assignment

Thoughts or suggestions would be appreciated.

Charles