Error converting from Simulink.SimulationInput to double

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Code_error.PNG

%% Speed Array
Speed = zeros(1,5001);
len = numel(Speed);
q=0;
for s = 1:len
    Speed(1,s) = q;
    q = q + (1/(len-1));
end
Trq_inst = zeros(1,401);
len_trq = numel(Trq_inst);
Trq_ref =1;
for t = 1:(len_trq) 
    % simIn = zeros(1,401);
    % simOutputs = zeros(1,401);    
    Trq_inst(1,t)= Trq_ref; 
    
    for i = 1:len
        simIn(i) = Simulink.SimulationInput('fl_name');    
        simIn(i) = setBlockParameter(simIn(i),'fl_name/Speed_sweep','Spd',Speed(i));
    end
    simOutputs = sim(simIn);
    for i = 1: len
        Res1 = simOutputs(1,i).sldemo_absbrake_output{1}.Values.Res1.Data;
        Res2= simOutputs(1,i).sldemo_absbrake_output{1}.Values.Res2.Data;
        Struc = struct("Res1",Res1,"Res2",Res2);
        fname = sprintf('Trq%d_Spd%d.mat', Trq_ins(1,t)*400,5000*Speed(1,i));
        save(fname,"Struc")
        %save("trq_400.mat","Struc")
    end