Error on "featherlight.css"

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yes it works but as you inspect page there are 4 error message gives... mostly on not found css file

Type: Pre-Sale
Status: New
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concrete5 Environment Information

concrete 8

Browser User-Agent String

Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36

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