MATLAB: How to resolve the error “cell contents reference from a non-cell array object”? Thank you!!

cell contents reference from a non-cell array object

Looking for help on my project. Any help is largely appraciated!!
fid = fopen('test.cal'); 
[paramlist l] = textscan(fid, '%s %s %s %s %s'); 
fclose(fid);
[len wid] = size(paramlist{1}); %[len wid]=[18 1]
j = 1;
chanlist = cell(1,len); %create a cell array named chanlist
 for i=1:len
    if(strcmp(paramlist{1}{i},'channel')); 
    chanlist{1,j} = {paramlist{2}{i},paramlist{3}{i},paramlist{4}{i},paramlist{5}{i}};
    disp(chanlist{1,j});
    j=j+1;
    end
 end
 for i=1:len 
    if(strcmp(chanlist{i}{1}, 'DIGOUT'))%%when I run the code, it shows error happens here
        if (str2double(chanlist{i}{3}) < 28) %28 digital IOs on a minilab1008

            if (strcmp(chanlist{i}{2}, '0'))
                    disp('board 0 DIGOUT');
            elseif (strcmp(chanlist{i}{2},'1'))
                    disp('board 1 DIGOUT');
            else 'only boards 0 and 1 supported';
            end
        else 'ignoring digital output';
        end
    elseif strcmp(chanlist{i}{1}, 'DIGIN')
        if (str2double(chanlist{i}{3}) < 28) %28 digital IOs on a minilab1008
            if (strcmp(chanlist{i}{2}, '0'))
                    disp('board 0 DIGIN');
            elseif (strcmp(chanlist{i}{2},'1'))
                    disp('board 1 DIGIN');
            else 'only boards 0 and 1 supported';
            end;
        else 'ignoring digital output';
        end;
    end
end
Here is the "test.cal" file: (3rd column represents board number, 4th column represents line/channel number)
 channel DIGOUT 0 0 shutter1
 channel DIGOUT 0 1 shutter2
 channel DIGOUT 0 2 shutter3
 channel DIGOUT 0 3 shutter4
 channel DIGOUT 1 0 shutter5
 channel DIGIN 0 4 shutter1state
 channel DIGIN 0 5 shutter2state
 channel DIGIN 0 6 shutter3state
 channel DIGIN 0 7 shutter4state
 channel DIGIN 1 1 shutter5state
 channel ANAOUT 0 0 TempCtrlVolt
 channel ANAOUT 0 1 PositionCtrlVolt
 channel ANAOUT 1 0 TempCtrlVolt
 channel ANAIN 0 0 PSUVolt
 channel ANAIN 0 1 PositionCtrlState
 channel ANAIN 1 0 PSUVolt
 calib TempCtrlVolt 0 120
 calib TempCtrlVolt 1 120

Best Answer

Check the type of chanlist{i} by setting either a breakpoint in the failing line or let the debugger stop Matlab in case of errors:
dbstop if error
The next problem will occur, when you check chanlist{i}{3} < 28: You've imported all data using the '%s' format in textscan. Therefore you cannot find numeric data in the cells.
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