errors in running libor masek iris recognition code

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i'm currently working on libor masek iris recognition code and am unable to run it due to errors such as Error using imread>parse_inputs (line 476) The filename or url argument must be a string.

Error in imread (line 335) [filename, fmt_s, extraArgs] = parse_inputs(varargin{:});

Error in createiristemplate (line 39) eyeimage = imread(eyeimage_filename); when i renamed file to abc.bmp the following error pops up Undefined function or variable 'abc'. Undefined variable "abc" or function "abc.bmp". when running segmentiris.m file the errors are Error in findcircle (line 38) lradsc = round(lradius*scaling);

Output argument "row" (and maybe others) not assigned during call to "C:\Users\Raviteja pc\Desktop\New folder\work 1\Segmentation\findcircle.m>findcircle".

Error in segmentiris (line 50) [row, col, r] = findcircle(eyeimage, lirisradius, uirisradius, scaling, 2, 0.20, 0.19, 1.00, 0.00);

be kind to reply soon.Thanks in advance.