Image not displaying in twitter cards

When i verify my URL in twitter validator. Image is not displaying and also am getting below error. COuld you please help me.

INFO:  Page fetched successfully
INFO:  24 metatags were found
INFO:  twitter:card = summary_large_image tag found
INFO:  Card loaded successfully
WARN:  The image URL specified by the 'og:image' metatag may be restricted by the site's robots.txt file, which will prevent Twitter from fetching it.
  • This topic was modified 4 days, 9 hours ago by Jan Dembowski. Reason: Moved to Fixing WordPress, this is not an Everything else WordPress topic

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