Index exceeds the number of array elements (2)

Hello, I am a beginner in MATLAB, I am trying to use an app called NETQUANT, which analyze images. But shows me this error a lot and i can't solve the problem .

Index exceeds the number of array elements (2).

Error in NQ_prepareData (line 170)

outDir = [targetDir filesep foldernames{iFolder} filesep filenames{iFile} filesep

'raw_images' filesep (channels{iChan})];

Error in NETQUANT/prepareDataButtonPushed (line 876)

NQ_prepareData (app.p.folder, app.p.targetDir, app.p, 'preview', false, 'type',...

Error in NETQUANT/batchallButtonPushed (line 267)

prepareDataButtonPushed(app);

Error using matlab.ui.control.internal.controller.ComponentController/executeUserCallback (line 382)

Error while evaluating Button PrivateButtonPushedFcn.

>>

This is the code of the app:

                        %create output directories
                        outDir = [targetDir filesep foldernames{iFolder} filesep filenames{iFile} filesep 'raw_images' filesep (channels{iChan})];
                        if ~exist(outDir,'dir')
                            mkdir(outDir)
                        end
                        
                        name = filenames{iFile}(1:end-length(inputs.extension));
                        
                        iTime=1;
                        
                        
                        for iIm = iChan:p.nChan:nIm
                            
                            bfsave(imData{1,1}{iIm,1},[outDir filesep name '_'...
                                num2str(iTime,['%0' num2str(floor(log10(p.nTime))+1) '.f']) '.tif' ]);
                            iTime=iTime+1;
                            
                            waitbar(iIm/nIm);
                            
                        end
                        
                        %store parameter information to result folder
                        metadata = p;
                        metadata.flags.NQ_prepareData = 1; %set flags
                        save([targetDir filesep foldernames{iFolder} filesep filenames{iFile} filesep 'NQ_metadata.mat'],'metadata'); %save file
                        
                        
                    end
                end
                
            end
            
    end
    
end
close(h);
disp('Image data has been prepared for processing.');
end

I hope you can help me, Thanks.