Tvheadend

Hi

Ive just run apt-get update on my system (ubuntu 14.4) and I get the following error messages:

Err https://dl.bintray.com stable/main amd64 Packages
server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none
Err https://dl.bintray.com stable/main i386 Packages
server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none
W: Failed to fetch https://dl.bintray.com/tvheadend/ubuntu/dists/stable/main/binary-amd64/Packages server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none

W: Failed to fetch https://dl.bintray.com/tvheadend/ubuntu/dists/stable/main/binary-i386/Packages server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none

E: Some index files failed to download. They have been ignored, or old ones used instead.

Have I done something wrong, or is there an issue with the repository?

Thanks