How to fix 'Error using contains First argument must be a string array, character vector, or cell array of character vectors.'

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I am getting the error:

Error using contains First argument must be a string array, character vector, or cell array of character vectors.

Error in xlsxdatatostructurearray/getgastablelisting (line 17) TF1 = contains(Directory{d},FilePrefix,'IgnoreCase',true);

Error in xlsxdatatostructurearray (line 25) for l = 1:length(getgastablelisting(FilePrefix, DirectoryName, filetype))

please help.

This is the code that is giving the error.

    function [LookupTableFiles] = getgastablelisting(FilePrefix, DirectoryName, filetype)
        LookupTableFiles = {};
        Directory = dir(DirectoryName);
        Directory = struct2cell(Directory);
        for d = 1:length(Directory)
            TF1 = contains(Directory{d},FilePrefix,'IgnoreCase',true);
            TF = contains(Directory{d},filetype,'IgnoreCase',true);
            if (TF1 == 1) && (TF == 1) 
                LookupTableFiles = {LookupTableFiles Directory{d}};
            end
        end
    end