Vagrant up fails with error

[IvikGH]

/etc/ansible/roles/ANXS.postgresql $ sudo vagrant up
[sudo] password for ivik:
Bringing machine 'anxs' up with 'virtualbox' provider...
==> anxs: Checking if box 'ubuntu/trusty64' is up to date...
==> anxs: Clearing any previously set network interfaces...
==> anxs: Preparing network interfaces based on configuration...
anxs: Adapter 1: nat
anxs: Adapter 2: hostonly
==> anxs: Forwarding ports...
anxs: 22 (guest) => 2222 (host) (adapter 1)
==> anxs: Booting VM...
==> anxs: Waiting for machine to boot. This may take a few minutes...
anxs: SSH address: 127.0.0.1:2222
anxs: SSH username: vagrant
anxs: SSH auth method: private key
anxs: Warning: Remote connection disconnect. Retrying...
anxs: Warning: Remote connection disconnect. Retrying...
==> anxs: Machine booted and ready!
==> anxs: Checking for guest additions in VM...
anxs: The guest additions on this VM do not match the installed version of
anxs: VirtualBox! In most cases this is fine, but in rare cases it can
anxs: prevent things such as shared folders from working properly. If you see
anxs: shared folder errors, please make sure the guest additions within the
anxs: virtual machine match the version of VirtualBox you have installed on
anxs: your host and reload your VM.
anxs:
anxs: Guest Additions Version: 4.3.36
anxs: VirtualBox Version: 5.1
==> anxs: Setting hostname...
==> anxs: Configuring and enabling network interfaces...
==> anxs: Mounting shared folders...
anxs: /vagrant => /etc/ansible/roles/ANXS.postgresql
==> anxs: Running provisioner: ansible...
anxs: Running ansible-playbook...
ERROR! the role 'postgresql' was not found in /etc/ansible/roles/ANXS.postgresql/tests/roles:/etc/ansible/roles:/etc/ansible/roles/ANXS.postgresql/tests

The error appears to have been in '/etc/ansible/roles/ANXS.postgresql/tests/playbook.yml': line 9, column 7, but may
be elsewhere in the file depending on the exact syntax problem.

The offending line appears to be:

roles:
- postgresql
^ here

Ansible failed to complete successfully. Any error output should be
visible above. Please fix these errors and try again.

[yethee]

What version of Ansible you use?

[IvikGH]

Version ansible 2.2.0.0 works properly.

[eugenevd]

I've had the same problem.
Using ansible-galaxy install: ansible-galaxy install ANXS.postgresql
result in a directory named "ANXS.postgresql"
Yet the playbooks refer to the role as "postgresql" - renaming as such solved this issue for me.
(This caused warnings when doing vagrant commands, which was solved after 'vagrant destroy && vagrant up)

Not sure if this is the best approach though?