Why am I getting this error?

# apt-get update
Get:1 http://mirrors.usc.edu testing Release.gpg [189B]
Get:2 http://mirrors.kernel.org testing Release.gpg [189B]
Hit http://mirrors.kernel.org testing Release
Hit http://mirrors.usc.edu testing Release
Hit http://mirrors.kernel.org testing/main Packages/DiffIndex
Get:3 http://ftp.us.debian.org testing Release.gpg [189B]
Get:4 http://ftp.us.debian.org testing-proposed-updates Release.gpg [189
B]
Get:5 http://ftp.us.debian.org unstable Release.gpg [189B]
Get:6 http://ftp.us.debian.org stable Release.gpg [378B]
Get:7 http://ftp.debian.org testing Release.gpg [189B]
Get:8 http://ftp.debian.org testing-proposed-updates Release.gpg [189B]
Get:9 http://ftp.debian.org unstable Release.gpg [189B]
Get:10 http://ftp.debian.org stable Release.gpg [378B]
Get:11 http://ftp.debian.org proposed-updates Release.gpg [189B]
Hit http://mirrors.usc.edu testing/main Packages/DiffIndex
Ign http://download.videolan.org sid Release.gpg
Get:12 http://www.debian-multimedia.org testing Release.gpg [189B]
Get:13 http://www.debian-multimedia.org sid Release.gpg [189B]
Hit http://mirrors.kernel.org testing/main Sources/DiffIndex
Hit http://mirrors.usc.edu testing/main Sources/DiffIndex
Hit http://ftp.us.debian.org testing Release
Hit http://ftp.us.debian.org testing-proposed-updates Release
Hit http://ftp.us.debian.org unstable Release
Hit http://ftp.debian.org testing Release
Hit http://ftp.debian.org testing-proposed-updates Release
Hit http://ftp.debian.org unstable Release
Hit http://ftp.debian.org stable Release
Ign http://download.videolan.org sid Release
Hit http://www.debian-multimedia.org testing Release
Hit http://ftp.us.debian.org stable Release
Hit http://ftp.debian.org proposed-updates Release
Hit http://www.debian-multimedia.org sid Release
Ign http://download.videolan.org sid/main Packages/DiffIndex
Hit http://ftp.us.debian.org testing/main Packages/DiffIndex
Hit http://ftp.us.debian.org testing/non-free Packages/DiffIndex
Hit http://ftp.us.debian.org testing/contrib Packages/DiffIndex
Hit http://ftp.us.debian.org testing/main Sources/DiffIndex
Hit http://ftp.us.debian.org testing/non-free Sources/DiffIndex
Hit http://ftp.us.debian.org testing/contrib Sources/DiffIndex
Hit http://ftp.us.debian.org testing-proposed-updates/main
Packages/DiffIndex
Ign http://ftp.us.debian.org testing-proposed-updates/non-free
Packages/DiffIndex
Hit http://ftp.us.debian.org testing-proposed-updates/contrib
Packages/DiffIndex
Hit http://ftp.us.debian.org testing-proposed-updates/main Sources/DiffIndex
Hit http://ftp.debian.org testing/main Packages/DiffIndex
Hit http://ftp.debian.org testing/non-free Packages/DiffIndex
Hit http://ftp.debian.org testing/contrib Packages/DiffIndex
Hit http://ftp.debian.org testing/main Sources/DiffIndex
Hit http://ftp.debian.org testing/non-free Sources/DiffIndex
Hit http://ftp.debian.org testing/contrib Sources/DiffIndex
Hit http://ftp.debian.org testing-proposed-updates/main Packages/DiffIndex
Ign http://ftp.debian.org testing-proposed-updates/non-free
Packages/DiffIndex
Hit http://ftp.debian.org testing-proposed-updates/contrib
Packages/DiffIndex
Hit http://ftp.debian.org testing-proposed-updates/main Sources/DiffIndex
Ign http://download.videolan.org sid/main Sources/DiffIndex
Ign http://www.debian-multimedia.org testing/main Packages/DiffIndex
Ign http://ftp.us.debian.org testing-proposed-updates/non-free
Sources/DiffIndex
Hit http://ftp.us.debian.org testing-proposed-updates/contrib
Sources/DiffIndex
Hit http://ftp.us.debian.org unstable/main Packages/DiffIndex
Hit http://ftp.us.debian.org unstable/non-free Packages/DiffIndex
Hit http://ftp.us.debian.org unstable/contrib Packages/DiffIndex
Hit http://ftp.us.debian.org unstable/main Sources/DiffIndex
Hit http://ftp.us.debian.org unstable/non-free Sources/DiffIndex
Hit http://ftp.us.debian.org unstable/contrib Sources/DiffIndex
Ign http://ftp.us.debian.org stable/main Packages/DiffIndex
Ign http://ftp.us.debian.org stable/non-free Packages/DiffIndex
Ign http://ftp.us.debian.org stable/contrib Packages/DiffIndex
Ign http://ftp.us.debian.org stable/main Sources/DiffIndex
Ign http://ftp.us.debian.org stable/non-free Sources/DiffIndex
Ign http://ftp.debian.org testing-proposed-updates/non-free
Sources/DiffIndex
Hit http://ftp.debian.org testing-proposed-updates/contrib Sources/DiffIndex
Hit http://ftp.debian.org unstable/main Packages/DiffIndex
Hit http://ftp.debian.org unstable/non-free Packages/DiffIndex
Hit http://ftp.debian.org unstable/contrib Packages/DiffIndex
Hit http://ftp.debian.org unstable/main Sources/DiffIndex
Hit http://ftp.debian.org unstable/non-free Sources/DiffIndex
Hit http://ftp.debian.org unstable/contrib Sources/DiffIndex
Ign http://ftp.us.debian.org stable/contrib Sources/DiffIndex
Hit http://ftp.us.debian.org testing-proposed-updates/non-free Packages
Hit http://ftp.us.debian.org testing-proposed-updates/non-free Sources
Ign http://ftp.us.debian.org stable/main Packages
Ign http://ftp.debian.org stable/main Packages/DiffIndex
Ign http://ftp.debian.org stable/non-free Packages/DiffIndex
Ign http://download.videolan.org sid/main Packages
Ign http://www.debian-multimedia.org sid/main Packages/DiffIndex
Ign http://ftp.us.debian.org stable/non-free Packages
Ign http://ftp.us.debian.org stable/contrib Packages
Ign http://ftp.us.debian.org stable/main Sources
Ign http://ftp.debian.org stable/contrib Packages/DiffIndex
Ign http://ftp.debian.org stable/main Sources/DiffIndex
Ign http://ftp.debian.org stable/non-free Sources/DiffIndex
Hit http://www.debian-multimedia.org testing/main Packages
Ign http://download.videolan.org sid/main Sources
Ign http://ftp.us.debian.org stable/non-free Sources
Ign http://ftp.us.debian.org stable/contrib Sources
Ign http://ftp.debian.org stable/contrib Sources/DiffIndex
Hit http://ftp.debian.org proposed-updates/main Packages/DiffIndex
Hit http://ftp.debian.org proposed-updates/non-free Packages/DiffIndex
Hit http://ftp.debian.org proposed-updates/contrib Packages/DiffIndex
Hit http://ftp.debian.org proposed-updates/main Sources/DiffIndex
Hit http://ftp.debian.org proposed-updates/non-free Sources/DiffIndex
Hit http://ftp.debian.org proposed-updates/contrib Sources/DiffIndex
Hit http://ftp.debian.org testing-proposed-updates/non-free Packages
Hit http://ftp.us.debian.org stable/main Packages
Hit http://ftp.us.debian.org stable/non-free Packages
Hit http://ftp.us.debian.org stable/contrib Packages
Hit http://ftp.us.debian.org stable/main Sources
Hit http://ftp.us.debian.org stable/non-free Sources
Hit http://www.debian-multimedia.org sid/main Packages
Hit http://ftp.debian.org testing-proposed-updates/non-free Sources
Ign http://ftp.debian.org stable/main Packages
Ign http://ftp.debian.org stable/non-free Packages
Ign http://ftp.debian.org stable/contrib Packages
Ign http://ftp.debian.org stable/main Sources
Hit http://download.videolan.org sid/main Packages
Hit http://ftp.us.debian.org stable/contrib Sources
Ign http://ftp.debian.org stable/non-free Sources
Ign http://ftp.debian.org stable/contrib Sources
Hit http://ftp.debian.org stable/main Packages
Hit http://download.videolan.org sid/main Sources
Hit http://ftp.debian.org stable/non-free Packages
Hit http://ftp.debian.org stable/contrib Packages
Hit http://ftp.debian.org stable/main Sources
Hit http://ftp.debian.org stable/non-free Sources
Hit http://ftp.debian.org stable/contrib Sources
Get:14 http://security.debian.org stable/updates Release.gpg [189B]
Get:15 http://security.debian.org testing/updates Release.gpg [189B]
Hit http://security.debian.org stable/updates Release
Hit http://security.debian.org testing/updates Release
Ign http://security.debian.org stable/updates/main Packages/DiffIndex
Ign http://security.debian.org stable/updates/contrib Packages/DiffIndex
Ign http://security.debian.org stable/updates/non-free Packages/DiffIndex
Ign http://security.debian.org testing/updates/main Packages/DiffIndex
Ign http://security.debian.org stable/updates/main Packages
Ign http://security.debian.org stable/updates/contrib Packages
Ign http://security.debian.org stable/updates/non-free Packages
Hit http://security.debian.org testing/updates/main Packages
Hit http://security.debian.org stable/updates/main Packages
Hit http://security.debian.org stable/updates/contrib Packages
Hit http://security.debian.org stable/updates/non-free Packages
Fetched 15B in 21s (1B/s)
Reading package lists... Done
W: There is no public key available for the following key IDs:
B5D0C804ADB11277
W: There is no public key available for the following key IDs:
B5D0C804ADB11277
W: You may want to run apt-get update to correct these problems

Is this my side or server's side? If it is my side, then how do I fix
this? I already tried apt-get clean and rerunning apt-get update. No
changes.

Thank you in advance. 
--
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