Function 'subsindex' is not defined for values of class 'channel.rayleigh'.

Hi ! i am computing SINR using this formula SINR = P*|h|^2/(No + I) for this "h" used

h=rayleighchan
this way:
for i=1:UE_A 
    path_loss(i)=148.1+37.6*log(DIST_A(i))+ 8*randn(1) - 10;
    path_los(i)=10^(path_loss(i)/10);
    I(i)=PT_M-path_loss(i);   
    h=rayleighchan;
    UE_A_SINR(i)=PT_M*h/(noise_figr+sum(I(i))); 
    W_A=1/UE_A;
    R_A(i)=W_A*size_RB*log2(1+UE_A_SINR(i)); 
end

and i have an error "Function 'subsindex' is not defined for values of class 'channel.rayleigh'"