uncaught exception: join(): Passing glue string after array is deprecated. Swap the parameters (errno: 8192) in /var/www/html/assets/ckeditor/plugins/ckeditor_wiris/integration/lib/php/Boot.class.php at line #834join(): Passing glue string after array is deprecated. Swap the parameters

in file: /var/www/html/assets/ckeditor/plugins/ckeditor_wiris/integration/lib/php/Boot.class.php line 834
#0 [internal function]: _hx_error_handler()
#1 /var/www/html/assets/ckeditor/plugins/ckeditor_wiris/integration/lib/php/Boot.class.php(834): join()
#2 /var/www/html/assets/ckeditor/plugins/ckeditor_wiris/integration/lib/php/Boot.class.php(853): _hx_build_paths()
#3 /var/www/html/assets/ckeditor/plugins/ckeditor_wiris/integration/index.php(7): require_once('/var/www/html/a...')
#4 {main}