Troubling installing llvm-toolchain repository Ubuntu 14.04

Hey guys, I'm trying to install the following repository for Ubuntu install but the repository isn't being found on the server. Any advise?
sudo add-apt-repository "deb http://llvm.org/apt/trusty/llvm-toolchain-trusty-3.5-binaries main"
The requested URL /apt/trusty/llvm-toolchain-trusty-3.5-binaries main was not found on this server.

Thanks,
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