Hi everyone, i need help. When I run my script, i don't get an error message all I get from the command line is 'Lab 1: no data', what might be the problem with my script?

for iLength = 1:42
    if iLength < 10
      label = sprintf('0%s',num2str(iLength));
    else
      label = num2str(iLength);
    end
    fn   = sprintf('%s.txt',label);
    A    = load(fn);
    [m n]    = size(A);
    event_length = iLength + 7;
    for ievent = 1:event_length

         if ievent < 10
            event_label = sprintf('0%s',num2str(ievent));
         else
            event_label = num2str(ievent);
         end
         ES = zeros(m,n)
         for i = 1:m
             start_date = num2str(A(i));
             % gn   = sprintf('%s%s',start_date,event_label);
             gn   = sprintf('events/%s/mslp_%s_%s',label,start_date,event_label);
          B    = load(gn);
          ES   = ES + B;
     end
     EM = ES./m;
     fn = sprintf('events/mslp_comp_%s.%s',start_date,event_label);
     dlmwrite(fn,EM)
    end
  end