Can not decode GMSK signal after Timing Synchronizer...

Hi All! How can I decode GMSK signal after using comm.GMSKTimingSynchronizer? I try use this code (which similar one from the Matlab help for MSK signal):

if true
  % code
  hMod = comm.GMSKModulator('BitInput', true, 'SamplesPerSymbol',14);
  txBits = randi([0 1], 100*10, 1);   %Create data sequence
  txSym = step(hMod, txBits);
  hDemod = comm.GMSKDemodulator('BitOutput', true, 'SamplesPerSymbol', 14);
  rxBits = step(hDemod, txSym);
  hError = comm.ErrorRate('ReceiveDelay', 16);
  errorStats = step(hError, txBits, rxBits)
  %Demodulaition is OK

    %Now try recover signal
    hTimeSync = comm.GMSKTimingSynchronizer('SamplesPerSymbol',14, 'ErrorUpdateGain',0.01);
    [rxSym timEst] = step(hTimeSync, txSym);
    hDemod = comm.GMSKDemodulator('BitOutput', true, 'SamplesPerSymbol', 1);
    rxBits = step(hDemod, rxSym);
    hError = comm.ErrorRate('ReceiveDelay', 16);
    errorStats = step(hError, txBits, rxBits)
  end

Jury