State is required for ansible service

playbook/roles/slapos-proxy/tasks/main.yml

-  - name: Install packages using apt
+- name: Install packages using apt
     apt: name=slapos-node state=present update_cache=yes cache_valid_time=3600
     when: ansible_os_family == "Debian"
 
@@ -18,5 +18,5 @@
     wait_for: host=127.0.0.1 port=8080 delay=10
 
   - name: Run slapos format for initial bootstrap
-    service: name="slapos node format" arguments="--now --alter_user=True"
+    service: name="slapos node format" arguments="--now --alter_user=True" state=started
     when: slapos_cfg.stat.exists == False
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