Index in Position 1 is Invalid. Array Indices must be positive integers or logical values

Steady state
1

Hi,
I am trying to use a simple seignioriage model to analyze MMT. After creating my model I am getting the error “Index in position 1 is invalid. Array indices must be positive inters or logical values”. I don’t know what this error means but any help would be appreciated.

% Variables
var p, T, N;
varexo G, B;
parameters mu, n;

% Calibration
mu=0.12;
n=0.03;

model;
1+p=(1+mu)/(1+n)*(T/T(+1));
G=B+mu/(1+mu)*N+T;
N(+1)=(1+n)*N;
end;

initval;
p=0.02;
T=0.357;
G=2;
B=1;
N=6;
end;

steady;

shocks;
var G;
periods 0:50, 51:200;
values 2, 4;
var B;
periods 0:50, 51:200;
values 1, 2;
end;

endval;
G=2;
B=1;
end;

steady;

perfect_foresight_setup(periods=200);
perfect_foresight_solver;

display(p);

subplot(2,3,1);plot(p);title('Inflation')
subplot(2,3,2);plot(T);title('Taxes')
subplot(2,3,3);plot(B);title('Debt')
subplot(2,3,4);plot(N);title('Population')```
2

Your model does not have lags, so you cannot set shocks for period 0, only starting in period 1.