Issue with port option in 2.4.0 version

Hi, I update to the 2.4 today and i got issue with docker-compose when i try to add the following line to my configuration file (docker-compose.yml) : ports: - "127.0.0.1:9292:9090"

I got the following error:

ERROR: for ContainerName expected string or buffer Traceback (most recent call last): File "/usr/local/bin/docker-compose", line 11, in <module> sys.exit(main()) File "/usr/local/lib/python2.7/dist-packages/compose/cli/main.py", line 68, in main command() File "/usr/local/lib/python2.7/dist-packages/compose/cli/main.py", line 118, in perform_command handler(command, command_options) File "/usr/local/lib/python2.7/dist-packages/compose/cli/main.py", line 926, in up scale_override=parse_scale_args(options['--scale']), File "/usr/local/lib/python2.7/dist-packages/compose/project.py", line 424, in up get_deps File "/usr/local/lib/python2.7/dist-packages/compose/parallel.py", line 69, in parallel_execute raise error_to_reraise TypeError: expected string or buffer

I have no issue when i downgrade again to the 2.3 version of the package

To reproduce the issue, i use the following configuration ( it doesn’t seem to depend on the image):

version: '2'

services :
    ContainerName:
        image: bae2d441e03a
        ports:
            - "127.0.0.1:9292:9090"

I run on Ubuntu 14.04.5 LTS with the following package:

docker==2.4.0
docker-compose==1.14.0
docker-pycreds==0.2.1
dockerpty==0.4.1
Python 2.7.6
Client:
 Version:      17.05.0-ce
 API version:  1.29
 Go version:   go1.7.5
 Git commit:   89658be
 Built:        Thu May  4 22:06:06 2017
 OS/Arch:      linux/amd64

Server:
 Version:      17.05.0-ce
 API version:  1.29 (minimum version 1.12)
 Go version:   go1.7.5
 Git commit:   89658be
 Built:        Thu May  4 22:06:06 2017
 OS/Arch:      linux/amd64
 Experimental: false

[gregflynn]

If you’re on Arch and this bit you:

sudo pacman -U /var/cache/pacman/pkg/python-docker-2.3.0-1-any.pkg.tar.xz

assuming 2.3 is still in your pacman cache, confirmed the downgrade fixed it for me locally

[digitaldavenyc]

This is causing a pretty big issue on Circle CI right now