Responsive Filemanager Uncaught Error: Call to undefined function mime_content_type()

CKeditor de filemanager_access_key: kullanımı
URL lere ekstra get degeri ekliyoruz.
akey=myprivatekey

        CKEDITOR.replace('editor', {
      skin: 'moono-lisa',
      external_filemanager_path:"../../filemanager/",
      filemanager_title:"Filemanager" ,

      filebrowserBrowseUrl : '../../filemanager/dialog.php?akey=myprivatekey&type=2&editor=ckeditor&fldr=',
      filebrowserUploadUrl : '../../filemanager/dialog.php?akey=myprivatekey&type=2&editor=ckeditor&fldr=',
      filebrowserImageBrowseUrl : '../../filemanager/dialog.php?akey=myprivatekey&type=1&editor=ckeditor&fldr='

          });