What is wrong with my command to get LibO ppa installed?

I try get the Lauchpad ppa for LibO installed on my kubuntu (14.04) machine.

I entered following terminal command and got the the message that the ppa name is not correct:

rost@rost-ThinkPad-X240:~$ sudo add-apt-repository ppa:rost/libreoffice/libreoffice-4-3
[sudo] password for rost: 
Cannot add PPA: 'ppa:rost/libreoffice/libreoffice-4-3'.
Please check that the PPA name or format is correct.

According to: https://launchpad.net/~libreoffice/+archive/ubuntu/libreoffice-4-3
the ppa name is: ppa:libreoffice/libreoffice-4-3

What am I doing wrong?

Help is very much appreciated!

You shouldn’t use older LO versions when you can have newest.

Anyway, you wrote the command wrong, it should be

sudo add-apt-repository ppa:libreoffice/libreoffice-4-3

The line is written under Adding this PPA to your system.

@rautamiekka - Thanks for your quick reply. Command worked. Download and installation running in the background.

Next I will install v4.4 to have finally 3 versions in my kubuntu machine:
4.2 from the kubuntu repository
and 4.3 and 4.4 from the Lauchpad ppa.