How do I fix 'imread' related error ?

I installed Matlab R2015a on a 64bit windows 8 laptop and have the image processing toolbox. All folders and subfolders are in the matlab work path.

PROBLEM 1. READING AN IMAGE

>> A= imread('boy14.jpg');

Error using assert
Too many input arguments.
Error in isjpg (line 8)
assert(fid ~= -1, message('MATLAB:imagesci:validate:fileOpen', filename));
Error in imftype (line 50)
            tf = feval(fmt_s.isa, filename);
Error in imread (line 359)
    [format, fmt_s] = imftype(filename);

2. TO DISPLAY MULTIPLE IMAGES

image_folder = 'B:\Matlabcode2015\codes\Mboy';
filenames = dir(fullfile(image_folder, '*.jpg'));  
total_images = numel(filenames);    
 for n = 1:total_images
  full_name= fullfile(image_folder, filenames(n).name);%specifies images names, full path and extension
  our_images = imread(filenames);  % Read images  
   figure (n)    % used index n so old figs are not over written by new new figs
    imshow(our_images) 
  end

THE ERROR MESSAGE I GET :

>> read_image
Error using imread>parse_inputs (line 457)
  The file name or URL argument must be a string.
Error in imread (line 316)
  [filename, fmt_s, extraArgs] = parse_inputs(varargin{:});
Error in read_image (line 8)
  our_images = imread(filenames);                 % Read images

Answer 1

[Walter Roberson]

Checking around, it appears most probably that you have your own assert.m that is being used instead of the MATLAB assert.m . Please check with

which -all assert

and probably the first entry is something you have added to your MATLAB path.