undefined method each with index rspec

DEBUG: 2015-11-15 08:29:51 +0000: Hiera YAML backend starting
DEBUG: 2015-11-15 08:29:51 +0000: Looking up elastic_hosts in YAML backend
DEBUG: 2015-11-15 08:29:51 +0000: Looking for data source test
DEBUG: 2015-11-15 08:29:51 +0000: Found elastic_hosts in test
DEBUG: 2015-11-15 08:29:51 +0000: Looking up trusted_hosts in YAML backend
DEBUG: 2015-11-15 08:29:51 +0000: Looking for data source test
DEBUG: 2015-11-15 08:29:51 +0000: Found trusted_hosts in test
.........FFF...

Failures:

  1) silex with defaults for params should contain Class[silex::params]
     Failure/Error: it { should contain_class('silex::params')  }

     Puppet::Error:
       Failed to parse template silex/var/config/settings.json.erb:
         Filepath: /var/tmp/silex/spec/fixtures/modules/silex/templates/var/config/settings.json.erb
         Line: 4
         Detail: undefined method `each_with_index' for "default":String
        at /var/tmp/silex/spec/fixtures/modules/silex/manifests/config.pp:25 on node centos-5.10
     # ./spec/classes/init_spec.rb:21:in `block (3 levels) in <top (required)>'

  2) silex with defaults for params should contain Class[silex::install]
     Failure/Error: it { should contain_class('silex::install') }

     Puppet::Error:
       Failed to parse template silex/var/config/settings.json.erb:
         Filepath: /var/tmp/silex/spec/fixtures/modules/silex/templates/var/config/settings.json.erb
         Line: 4
         Detail: undefined method `each_with_index' for "default":String
        at /var/tmp/silex/spec/fixtures/modules/silex/manifests/config.pp:25 on node centos-5.10
     # ./spec/classes/init_spec.rb:22:in `block (3 levels) in <top (required)>'

  3) silex with defaults for params should contain Class[silex::config]
     Failure/Error: it { should contain_class('silex::config')  }

     Puppet::Error:
       Failed to parse template silex/var/config/settings.json.erb:
         Filepath: /var/tmp/silex/spec/fixtures/modules/silex/templates/var/config/settings.json.erb
         Line: 4
         Detail: undefined method `each_with_index' for "default":String
        at /var/tmp/silex/spec/fixtures/modules/silex/manifests/config.pp:25 on node centos-5.10
     # ./spec/classes/init_spec.rb:23:in `block (3 levels) in <top (required)>'

Finished in 0.95885 seconds (files took 0.7893 seconds to load)
15 examples, 3 failures

Failed examples:

rspec ./spec/classes/init_spec.rb:21 # silex with defaults for params should contain Class[silex::params]
rspec ./spec/classes/init_spec.rb:22 # silex with defaults for params should contain Class[silex::install]
rspec ./spec/classes/init_spec.rb:23