Error message seen with the INN RSS Multi Importer plugin

[benlk]

Deprecated: define(): Declaration of case-insensitive constants is deprecated in /Users/blk/sites/inndev/wp-content/plugins/inn-rss-multi-importer/inn-rss-multi-importer.php on line 24

Deprecated: define(): Declaration of case-insensitive constants is deprecated in /Users/blk/sites/inndev/wp-content/plugins/inn-rss-multi-importer/inn-rss-multi-importer.php on line 27

Deprecated: define(): Declaration of case-insensitive constants is deprecated in /Users/blk/sites/inndev/wp-content/plugins/inn-rss-multi-importer/inn-rss-multi-importer.php on line 30

Deprecated: define(): Declaration of case-insensitive constants is deprecated in /Users/blk/sites/inndev/wp-content/plugins/inn-rss-multi-importer/inn-rss-multi-importer.php on line 33

Deprecated: define(): Declaration of case-insensitive constants is deprecated in /Users/blk/sites/inndev/wp-content/plugins/inn-rss-multi-importer/inn-rss-multi-importer.php on line 36

Deprecated: define(): Declaration of case-insensitive constants is deprecated in /Users/blk/sites/inndev/wp-content/plugins/inn-rss-multi-importer/inn-rss-multi-importer.php on line 39

https://github.com/INN/umbrella-inndev/tree/master/wp-content/plugins/inn-rss-multi-importer

There may be other problems with this plugin; its upstream plugin has been closed on wp.org: https://wordpress.org/plugins/wp-rss-multi-importer/