Apt-get update duplicate entry error

[evilbunny]

I don't know a lot about Linux but when i run apt-get update on R64 on OMV i get this.

Code:

W: Duplicate sources.list entry http://packages.openmediavault.org/public/ erasmus/main arm64 Packages (/var/lib/apt/lists/packages.openmediavault.org_public_dists_erasmus_main_binary-arm64_Packages)
W: Duplicate sources.list entry http://packages.openmediavault.org/public/ erasmus/main armhf Packages (/var/lib/apt/lists/packages.openmediavault.org_public_dists_erasmus_main_binary-armhf_Packages)
W: You may want to run apt-get update to correct these problems

I've looked this up but cant figure out how to fix it.

cd /etc/apt
grep -rl packages.openmediavault.org .

The above should show which files the contain packages.openmediavault.org and then it's just a matter of using nano to edit one or more to remove the above warning