Warning: Attempt to write an unsupported data type to an ASCII file. I have a data which its class cell and its attributes global. I wanna save and write this data into text but I give this warning.

cellArray= '4004 638905.26736 4552506.2389'

 % cellArray            1x1               188  cell      global

startingFolder = 'C:\Program Files\MATLAB'

 if ~exist(startingFolder, 'dir')

    startingFolder = pwd

 end

defaultFileName = fullfile(startingFolder, '*.txt')

[baseFileName, folder] = uiputfile(defaultFileName, 'Select a file')

if baseFileName == 0

 return

 end

 fullFileName = fullfile(folder, baseFileName)

 save(fullFileName, 'cellArray',  '-ASCII')