The 'prefix' attribute on <head> for Open Graph is missing
Just add this prefix to your head element
<head prefix="og: http://ogp.me/ns#">
February 22, 2015
The prefix attribute on head for Open Graph is missing
Error:
The 'prefix' attribute on <head> for Open Graph is missing
Solution:
Just add this prefix to your head element
<head prefix="og: http://ogp.me/ns#">
The 'prefix' attribute on <head> for Open Graph is missing
Just add this prefix to your head element
<head prefix="og: http://ogp.me/ns#">
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