docker-compose. Client and server don't have the same version?

Question

Docker

Now I'm trying to set up omaha-server, hardly anyone knows what it is, but this error is more general than one program. I have already seen solutions to this problem, but I could not interpret them for this situation due to a different version of Ubuntu (14.04), and besides, I work with Docker-compose and Docker for the first time.

There is an instruction: tyk or briefly:

$ sudo apt-get update
$ sudo apt-get install docker.io
$ sudo apt-get install python-paver python-pip
$ sudo pip install -U docker-compose
$ git clone https://github.com/Crystalnix/omaha-server.git
$ cd omaha-server
$ sudo paver up_local_dev_server

It looks pretty simple, but when you run

sudo pip install -U docker-compose

I get the following:

Command python setup.py egg_info failed with error code 1 in /tmp/pip_build_root/setuptools
Storing debug log for failure in /root/.pip/pip.log

If I ignore this and move on, then when I run the last command, I get this:

ERROR: client and server don't have same version (client : 1.21, server: 1.18)

And this is where the most, for me, strange begins.

Firstly, the incomprehensibility of the error, because I do everything on the same server, where does the client and its version come from?

Secondly, where do the version data come from, if you look docker-compose -v, I get docker-compose version 1.18.0, build 8dd22a9, everything seems to match with the server version, but if I install version 1.21, then the error itself will remain with the same versions.