That's not an error. It's not even really a warning - I consider it more of a notification. Just ignore it. If you want to suppress that warning, run this function:
% http://www.mathworks.com/help/matlab/matlab_prog/suppress-warnings.html
function TurnOffWarnings
try
% To set the warning state, you must first know the message identifier for the one warning you want to enable.
% Query the last warning to acquire the identifier. For example:
% warnStruct = warning('query', 'last')
% messageID = warnStruct.identifier
% messageID =
% MATLAB:concatenation:integerInteraction
% Turn off this warning "Warning: Image is too big to fit on screen; displaying at 33% "
warning('off', 'Images:initSize:adjustingMag');
% Get rid of warning about directory already existing:
% "Warning: Directory already exists."
warning('off', 'MATLAB:MKDIR:DirectoryExists');
% Turn off note "Warning: Added specified worksheet." that appears in the command window.
warning('off', 'MATLAB:xlswrite:AddSheet');
% Get rid of warning about roipolyold being deprecated:
% "Warning: Function ROIPOLYOLD will be removed in the future. Use ROIPOLY instead"
warning('off', 'images:removing:function');
% Get rid of warning about wavread() being deprecated:
% "Warning: WAVREAD will be removed in a future release. Use AUDIOREAD instead."
warning('off', 'MATLAB:audiovideo:wavread:functionToBeRemoved');
% Get rid of warning about wavread() being deprecated:
% "Warning: figure JavaFrame property will be obsoleted in a future release. For more information see the JavaFrame resource on the MathWorks web site."
warning('off', 'MATLAB:HandleGraphics:ObsoletedProperty:JavaFrame');
% Turn off warning about variable names being modified if you use readtable() to read in column headers that have spaces in them.
% "Warning: Variable names were modified to make them valid MATLAB identifiers."
warning('off', 'MATLAB:table:ModifiedVarnames');
catch ME
errorMessage = sprintf('Error in function %s() at line %d.\n\nError Message:\n%s', ...
ME.stack(1).name, ME.stack(1).line, ME.message);
fprintf(1, '%s\n', errorMessage);
uiwait(warndlg(errorMessage));
end
return; % from TurnOffWarnings
