When a client configured for auto encryption fails to spawn mongocryptd (e.g. due to not being on the PATH), EncryptedClientBuilder.build() returns the error:

Error { kind: Io(Os { code: 2, kind: NotFound, message: "No such file or directory" }), labels: {}, wire_version: None, source: None }

It may be non-obvious (at least, it was to me) what caused this error. Proposal: expand/wrap the error to indicate this is due to failing to spawn mongocryptd.

To reproduce, see this example