how to use built in linear equalizer function?

Hello

i have QPSK system and try to equalize the recived signal and measure the error rate before and after equalization.

i use the (comm.linearequalizer ) function as below but i get values (NaN) after like 100 values which prevent me from measuring the error rate

can anyone help on how to correctly use this function

i have 1000 symbols. i take 100 as trainging data and i have signal with the noise to be equalized how i get the correct equalized signal

this s part of my code

thank you in advance

txbit=randi([0 1],n,1);
    txsym=bi2de(reshape(txbit,k,(length(txbit)/k)).','left-msb');
    y=pskmod(txsym,M);
    yplus=rectpulse(y,nsamp);
    ytx= yplus;
   
ynoisy = awgn(ytx,SNR,'measured');
    
    
    %%%%%%%%%%%%%%%%%%%%%%%%
    %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%5
  eqlms = comm.LinearEqualizer( ...
    'Algorithm','LMS', ...
    'NumTaps',8, ...
    'StepSize',0.03);

    yeq = eqlms(ynoisy,y(1:100));