{verify, verify_peer} warning using psk

[Oliver Bollmann]

We use ssl with psk option like:

[...

{user_lookup_fun, {fun client_lookup/2, <<"key">>}
{psk_identity,"me"}

...]

We got always warning:

      Description: "Authenticity is not established by certificate path 
validation"
      Reason: "Option {verify, verify_peer} and cacertfile/cacerts is 
missing"

but we are using no certs!!

Any hints?

-- 
Grüße
Oliver Bollmann