[Python] Ansible Playbook to install nginx server

I want to install nginx in ubuntu machine and start the service using Ansible playbook,

I am getting this error while running playbook "(): mapping values are not allowed in this context at line 7 column 10"

Here is the code I tried:

---
-
hosts: all
tasks:
- name: ensure nginx is at the latest version
apt: name=nginx state=latest
- name: "start nginx"
service:
name: nginx
state: started

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