DSP: Development Test Bench example code indexing error

So I tried this example code:

frameLength = 256;
fileReader = dsp.AudioFileReader(...
    'Counting-16-44p1-mono-15secs.wav',...
    'SamplesPerFrame',frameLength);
deviceWriter = audioDeviceWriter(...
    'SampleRate',fileReader.SampleRate);
scope = dsp.TimeScope(...
    'SampleRate',fileReader.SampleRate,...
    'TimeSpan',16,...
    'BufferLength',1.5e6,...
    'YLimits',[-1 1]);
dRG = noiseGate(...
    'SampleRate',fileReader.SampleRate,...
    'Threshold',-25,...
    'AttackTime',10e-3,...
    'ReleaseTime',20e-3,...
    'HoldTime',0);

visualize(dRG);

configureMIDI(dRG);

while ~isDone(fileReader)
    signal = fileReader();
    noisySignal = signal + 0.0025*randn(frameLength,1);
    processedSignal = dRG(noisySignal);
    deviceWriter(processedSignal);
    scope([noisySignal,processedSignal]);
end

release(fileReader);
release(deviceWriter);
release(scope);
release(dRG);

It gives me the following error:

Array formation and parentheses-style indexing with objects of class 'dsp.AudioFileReader' is not allowed.  Use objects
of class 'dsp.AudioFileReader' only as scalars or use a cell array.

Error in workbench (line 30)
    signal = fileReader();

I can't figure out how to solve it, please help.

Answer 1

[Merry Dai]

the problem that I meet is below