dupe src?

Installed nightly-build, now getting this when updating apt: W: Duplicate sources.list entry http://ppa.quickbuild.pearsoncomputing.net/trinity/trinity-nightly-build-de… precise/main amd64 Packages (/var/lib/apt/lists/ppa.quickbuild.pearsoncomputing.net_trinity_trinity-nightly-build-dependencies_ubuntu_dists_precise_main_binary-amd64_Packages) W: Duplicate sources.list entry http://ppa.quickbuild.pearsoncomputing.net/trinity/trinity-nightly-build-de… precise/main i386 Packages (/var/lib/apt/lists/ppa.quickbuild.pearsoncomputing.net_trinity_trinity-nightly-build-dependencies_ubuntu_dists_precise_main_binary-i386_Packages) W: Duplicate sources.list entry http://ppa.quickbuild.pearsoncomputing.net/trinity/trinity-nightly-builds/u… precise/main amd64 Packages (/var/lib/apt/lists/ppa.quickbuild.pearsoncomputing.net_trinity_trinity-nightly-builds_ubuntu_dists_precise_main_binary-amd64_Packages) W: Duplicate sources.list entry http://ppa.quickbuild.pearsoncomputing.net/trinity/trinity-nightly-builds/u… precise/main i386 Packages (/var/lib/apt/lists/ppa.quickbuild.pearsoncomputing.net_trinity_trinity-nightly-builds_ubuntu_dists_precise_main_binary-i386_Packages) Installation is through so I guess no biggie right now, but why? Lines are: deb http://ppa.quickbuild.pearsoncomputing.net/trinity/trinity-nightly-build-de… precise main deb http://ppa.quickbuild.pearsoncomputing.net/trinity/trinity-nightly-builds/u… precise main Do I need to specify the arch? -- -----BEGIN GEEK CODE BLOCK----- Version: 3.12 GCS d--(+)@ s-:+ a C++++ UL++ P+>++ L+++>++++ E-- W++ N o? K- w--(---) !O M+ V- PS+ PE Y++ PGP t++(---)@ 5 X+(++) R+(++) tv--(+)@ b++(+++) DI+++ D- G++ e* h>++ r* y? ------END GEEK CODE BLOCK------