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Monolix error Incomplete match, remaining unmatched input is: : output = E

Hi Everyone
I am getting a similar error, however rather than being a PK model, its a PD model
with the following structure,
[LONGITUDINAL]
input = {Cc,IC50, gamma, I, Kz,Kx,Ky,AN}
Cc = {use=regressor}
I = {use=regressor}

EQUATION:

if AN==1
Ki=Kz
Kz=0
elseif AN==2
Ki=Kx
elseif AN==3
Ki=Ky
end

E = 1 - Cc^gamma / (IC50*(1+(I^gamma/(Ki^gamma)) + Cc^gamma)
OUTPUT:
output = E

Depending on my categorical Covariate AN, I would like to calculate unique Ki values.

However the error i keep getting is as follows
“Incomplete match, remaining unmatched input is:
:
output = E”