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vf-chart.css not loading on Force.com sites

I have created a visualforce page by using visualforce chart component, chart components are working perfect in visualforce but after I created force.com site for that page and opened that page outside Salesforce as site page , page is loading properly but there is "vf-chart.css" which is not loading and showing empty css.
In browser, I clicked inspect element went to sources tab-> apexpages/chart folder -> vf-chart.css and this css is empty because of this chart compont is not highlting properly.
Any help will be appreciated??