Cannot convert a Symbol value to a string ember-cli

I am trying to set ember-cli.photoswipe locally and i come across to this issue:

Cannot convert a Symbol value to a string TypeError: Cannot convert a Symbol value to a string

These are the steps

after all these steps

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  git clone http://ift.tt/1BlScrg

  
  


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  ember install:addon ember-cli-photoswipe

  
  


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  ember server

  
  

My ember cli version is : "ember-cli": "0.1.7"