Error in importData text

The problem in importing my data, my M file where i loop on files and calculate mean, i get an error message saying

   Error in Untitled2 at 10
       mydata{k} = importdata(myfilename, ' ' );

Caused by:
    Error using text scan
    Unable to read any data from the file, text scan may not have read access.

and i checked and found mydata{k} is empty...i have no idea and i really need help to run this m file ?

the code is followed

 close all
 clear all 
 clc

 numfiles = 10;
 mydata = cell(1, numfiles);
 values=[];
 for k = 1:numfiles
   myfilename = sprintf('tt%d.txt',k);
   mydata{k} = importdata(myfilename, ' ' );
   values{k} = mydata{k}(:,2);
   m= mean(values{k});
   fid=fopen('MeanOutputTT.txt','at');
   fprintf(fid, '%f', m');
   fprintf(fid, '\n');
   fclose(fid);
 end

[xin wang]

Nice to meet you, I'd like to ask whether you have solved your question. I've a similiar code like yours. And I want to know how to solve this question like error in import data, thank you very much!

clc
clear all
close all

% Assignments
zdimension = input('Number of .tif images? ');

Unable to run the 'fevalJSON' function because it calls the 'input' function, which is not supported for this product offering.

% Subvolume is the region in which 3D data will be cut around three-phase
% contact point
subvolume = input('Dimension of subvolume? ');
subvolume = subvolume/2;
mydata = cell(1, zdimension);
% Import .tif images in MATLAB
% !!If different number of figures, change %03d!!
for k = 1:zdimension
  myfilename = sprintf('CPline%03d.tif', k);
  mydata{k} = importdata(myfilename);
end

[Mathieu NOE]

hello

can you share the data file that created the issue ?