This error message occurs when your yaml is malformed and does not properly define an image for a pipeline step or service.

You must define an image for every pipeline step:

pipeline:
  slack:
+   image: plugins/slack
    room: foo

You must define an image for every service:

services:
  mysql:
+   image: mysql

You may not nest steps in your pipeline:

pipeline:
- notify:
-   slack:
-     image: plugins/slack
-     room: foo
+ slack:
+   image: plugins/slack
+   room: foo

Questions?

We are always happy to help with questions you might have. Search our documentation or check out answers to common questions. You can also post questions or comments to our community forum.

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