Fetching the page failed because it’s denied by robots.txt:
http://php55.delivery-projects.com/i4i/topics/trade/impact-of-trade-reforms-on-labour-s-share-of-firm-revenues.html?timage=http://php55.delivery-projects.com/i4i/templates/i4ihome/images/debasish.fig.1.jpg:
Try removing the colon from the end of the twitter:image tag contents.
twitter:image
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