error with docker-compose

[skapytek]

Hi,
when im trying to run docker-compose im getting following error:
./start.sh: line 3: docker-compose: command not found

full log:

root@AT1:~/ovpn-admin# docker pull flant/ovpn-admin:latest
latest: Pulling from flant/ovpn-admin
213ec9aee27d: Pull complete
18e99ad55614: Pull complete
74cb2449f7f9: Pull complete
9966e75dcfcd: Pull complete
Digest: sha256:6a69140a3322c133e288b7f40579913035a4253c2b34789ba608aeed2dd9e44f
Status: Downloaded newer image for flant/ovpn-admin:latest
docker.io/flant/ovpn-admin:latest
root@AT1:~/ovpn-admin# cd
root@AT1:~# git clone https://github.com/flant/ovpn-admin.git
Cloning into 'ovpn-admin'...
remote: Enumerating objects: 621, done.
remote: Counting objects: 100% (223/223), done.
remote: Compressing objects: 100% (75/75), done.
remote: Total 621 (delta 182), reused 155 (delta 147), pack-reused 398
Receiving objects: 100% (621/621), 864.86 KiB | 3.35 MiB/s, done.
Resolving deltas: 100% (356/356), done.
root@AT1:~# cd ovpn-admin
root@AT1:~/ovpn-admin# ./start.sh
./start.sh: line 3: docker-compose: command not found