Replacing hydrolysis and fermentation reaction for different fermentation types in the 'Fermentation' unit

[SarvadaC]

Hello,
I have been trying to work on a xylitol biorefinery using yeast. However, every time I call the 'Fermentation' unit the program uses the by default hydrolysis reaction in the 'NRELBioreactor.py'. How do I replace the reactions in the code for the xylitol biorefinery? Here's what I have been trying so far:

Code:
R301 = units.Fermentation ('R301',M101-0, outs=('CO2', ''), tau=9, efficiency=0.90, N=4)

def _init(self, tau, N=None, V=None, T=305.15, P=101325., Nmin=2, Nmax=36,
efficiency=None, iskinetic=False, fermentation_reaction=None,
cell_growth_reaction=None):
R301._init(self, tau=tau, N=N, V=V, T=T, P=P, Nmin=Nmin, Nmax=Nmax)
self._load_components()
self.iskinetic = iskinetic
chemicals = self.chemicals
self.hydrolysis_reaction = Reaction('Xylose -> Xylitol', 'Xylose', efficiency, chemicals)
if fermentation_reaction is None:
if efficiency is None: efficiency = 0.9
fermentation_reaction = Reaction('Xylose -> Xylitol', 'Xylose', efficiency, chemicals, basis='wt')
else:
efficiency = fermentation_reaction.X
self.fermentation_reaction = fermentation_reaction
if cell_growth_reaction is None:
cell_growth_reaction = Reaction('Xylose -> Yeast', 'Xylose', 0.70, chemicals, basis='wt')
cell_growth_reaction.basis = 'mol'
self.cell_growth_reaction = cell_growth_reaction
self.efficiency = efficiency

Output:
Traceback (most recent call last):

Cell In[7], line 1
R301 = units.Fermentation ('R301',M101-0, outs=('CO2', ''), tau=9, efficiency=0.90, N=4)

File ~\AppData\Local\anaconda3\Lib\site-packages\biosteam_unit.py:390 in init
super().init(ID, ins, outs, thermo, **kwargs)

File ~\AppData\Local\anaconda3\Lib\site-packages\thermosteam\network.py:1038 in init
self._init(**kwargs)

File ~\AppData\Local\anaconda3\Lib\site-packages\biosteam\units\nrel_bioreactor.py:372 in _init
self.hydrolysis_reaction = Reaction('Sucrose + Water -> 2Glucose', 'Sucrose', 1.00, chemicals)

File ~\AppData\Local\anaconda3\Lib\site-packages\thermosteam\reaction_reaction.py:314 in init
self._stoichiometry = prs.get_stoichiometric_array(reaction, chemicals)

File ~\AppData\Local\anaconda3\Lib\site-packages\thermosteam\reaction_parse.py:26 in get_stoichiometric_array
stoichiometric_array = dct2arr(stoichiometry_dict, chemicals)

File ~\AppData\Local\anaconda3\Lib\site-packages\thermosteam\reaction_parse.py:50 in dct2arr
raise UndefinedChemical(ID)

UndefinedChemicalAlias: 'Sucrose'