Reg PSD function and pwelch

Hello :

I'm using the following function code to plot my eeg signal data into spectrogram. This function code is given by my friend. when i'm executing it , i'm getting an error in 54th line. I dont know how to correct it , i dont know where the error has come from. Kindly help.

function MakeEEGFile_AVR(tank, block, EEGChans)

AnalysisLoc='C:\Users\Nishanth\Documents\MATLAB'; %CHANGE to where Analysis should be saved SaveDir=[AnalysisLoc,tank,'\block-',num2str(block)];

%eval(['load ',SaveDir,'-BlockInfo','.mat numEpochs -mat']);

% For when resample to proper 256

f1=2.569901428222656e+002;

f2=256;%destination sampling rate

num_chunks=4;

tail_length=0; %defaults to 20,000

visualize=0;

maxep=21600;

% passbanddelta1=0.5;

% passbanddelta2=100;

% stopbanddelta1=0.45;

% stopbanddelta2=110;

epochl=4;

maxbin=120*epochl+1; %FFT goes out to 120 Hz (because otherwise psd goes to arbitrary frequency (nyquist)

f=0:1/epochl:120; %f is saved with Spectrafull

for j=1:length(EEGChans)

    chan=EEGChans(j);

    sig_EEG=ReadContinuousData_AVR(tank,block,'EEGs',chan);

    EEGdata256=resampling(sig_EEG,f1,f2,num_chunks,tail_length,visualize);

    numEpochs=floor(size(EEGdata256,2)/(f2*epochl));

    numEpochs=min(numEpochs,maxep);

    if length(EEGdata256) < numEpochs*epochl*f2 %pad EEGdata256 with zeros if has less data points than it should (shouldn't happen)

        EEGdata256 = [EEGdata256 zeros(1,(numEpochs*epochl*f2)-length(EEGdata256))];

        fprintf('DATA WARNING');

    end

    EEGdata256=EEGdata256(1:(numEpochs*epochl*f2)); %Cuts off extra data, uses numEpochs as law of how long it should be

    sig1=reshape(EEGdata256,f2*epochl,numEpochs);

    spectr=zeros(maxbin,numEpochs); %Rows: frequencies, Columns: epochs

    fprintf(['Running PWELCH for EEG ',num2str(chan),'\n']);

    for ep=1:numEpochs

        %This is big processing step. spectr is created by pwelch

        EEG = sig1(:,ep);

            Pxx=pwelch(EEG,hanning(epochl*f2),[],epochl*f2,f2);

            spectr(:,ep)=Pxx(1:maxbin);

    end;

    clear sig1;

    eval(['save ', SaveDir,'-EEGch',num2str(chan),'-SpectraComplete.mat f spectr EEGdata256 -mat']);

    clear spectr EEGdata256;

    fprintf(['SpectraComplete created for EEG channel ',num2str(chan),'\n']);

end

fprintf(['EEG files created for ',tank,' block: ',num2str(block),'\n']);

end

The error I'm getting is Undefined function or method 'ReadContinuousData_AVR' for input arguments of type 'double