Error due to Depreciated function – Header already sent

  • Hi, I get a few error message when activating the MMM file list:
    Deprecated: Required parameter $regex follows optional parameter $str in /Users/……./Local Sites/academia/app/public/wp-content/plugins/mmm-file-list/mm_filelist_plugin.php on line 417

    and

    The plugin generated 229 characters of unexpected output during activation. If you notice “headers already sent” messages, problems with syndication feeds or other issues, try deactivating or removing this plugin.

    Is there maybe a update for this?
    Thank you

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