Lots of errors

I’m getting lots of errors on my site when I try to switch. Even when I’m not switching I get:

WordPress database error: [Table 'db.wp_icl_strings' doesn't exist]
SELECT s.name, s.value, t.value AS translation_value, t.status FROM wp_icl_strings s LEFT JOIN wp_icl_string_translations t ON s.id = t.string_id WHERE s.context = 'theme x' AND (t.language = 'en' OR t.language IS NULL)

https://wordpress.org/plugins/wordpress-language/