Thank you for the example file. There is no issue for loading the file you sent me with the current version of Brainstorm on Matlab 2022b. It works both with "Import MEG/EEG" and "Review raw file".
Are you sure you sent a file that causes an error on your end?
If your version of Brainstorm is up-to-date and you sent the correct file, try removing from your Matlab path all the folders that are not directly related with Matlab or Brainstorm.
You can't find any solution to get it to work, it might be an issue with your Matlab version, if we use in this reader some functions that are not available on older Matlab versions.
Please copy-paste here the output of the command ver executed in the Matlab command window.