I can't get my code to run

My code wont run and I keep getting:

Error using textread (line 162)
File not found.

Error in WeekImages (line 20)
[Seperation, Measured] = textread(data_path, '%f %f', 'headerlines', 1);

The Heading for my columns from my data are: Seperation Measured

My code is:

%% Program for reading data from txt file
clear all;
close all;

main_path  = 'D:\UNI\2021\ERB302 Applied Geophysics\CodeImages\';
print_check = 1;
data_path= strcat(main_path, 'Data\Exercise_Image.txt');
scriptname = mfilename( 'fullpath' );

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Open log file for writing

% fid = fopen( log_file, 'w+' );
fid = 1; %displays on the screen%
fprintf( fid, 'This is %s, running...\n', scriptname );

%% Read data file
[Seperation, Measured] = textread(data_path, '%f %f', 'headerlines', 1);

Answer 1

[Jan]

The error message is clear: "File not found." There is no file called:

'D:\UNI\2021\ERB302 Applied Geophysics\CodeImages\Data\Exercise_Image.txt'

You have to fix the path or the file name.

[EDITED after reading new details in your answer]

The message is still the same: The file, you try to open, does not exist. If this happens, let Matlab show you the file name:

try
  [Seperation, Measured] = textread(data_path, '%f %f', 'headerlines', 1);
catch ME
  msg = sprintf('Cannot read file: %s\n%s\n', data_path, ME.message);
  error('Your:Error:ID', '%s', msg);
end

You will see this folder:

'D:\UNI\2021\ERB302 Applied Geophysics\CodeImages\Data\Data\Exercise_Data.txt'
%                                                 ^^^^ ^^^^ twice...

Hints:

• Use fullfile instead of strcat to concatenate paths. This cares for the correct file separators automatically.
• Omit the brute clear all, close all header, because it is a shot in your knee. This wastes a lot of time without a profit. Teachers suggest to use it, because they have used it when they were students. But this is "cargo cult programming" - as WikiPedia for details.
• Instead of hard codeing the path, you can determine the folder of the m-file dynamically:

Folder     = fileparts(mfilename('fullpath'));
DataFolder = fullfile(Folder, 'Data');

Answer 2

[nicholas moran]

Hello Jan, slightly confused. This is the code path:

[Jan]

Please post code as text, such that the readers can use it by copy&paste. Screenshots are less useful.

See my analysis in the [EDITED] section of my answer.