Full Idea
It is sometimes claimed that the behaviour of definite non-count descriptions shows Russell's Theory of Descriptions itself to be false. ....but it isn't a general theory of descriptions, but precisely a theory of singular descriptions.
Gist of Idea
Non-count descriptions don't threaten Russell's theory, which is only about singulars
Source
comment on Bertrand Russell (On Denoting [1905]) by Henry Laycock - Words without Objects 3.1
Book Reference
Laycock,Henry: 'Words without Objects' [OUP 2006], p.101