Rails not parsing a valid YAML
===

I'm trying to parse the following YAML with my rails(3.2.7) application

    ---
    main-menu:
      - mitem: Test1
        controller: user
        action: test
      - mitem: Test
        controller: user
        action: test2
        - mitem: Test3
          controller: user
          action: test

Unfortunately straight when I load my file

		require "yaml"
		@menu = YAML.load_file(file)
I get an error 

    Psych::SyntaxError in User#test
    
    Showing /srv/http/fiss/app/views/layouts/application.html.haml where line #12 raised:

    (/srv/http/fiss/app/assets/yaml/menu.yaml): did not find expected key while parsing a     block mapping at line 6 column 5

I'm new to Rails (and YAML), however I have checked the code with [YAML Lint](http://yamllint.com/) and apparently the YAML code is valid. What's causes this?