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Your server throws a http500. Please increase the error reporting level in the Joomla Configuration to see a useful error message:
Great! :) There is something more:
Fatal error: Call to undefined method JDocumentRaw::addCustomTag() in ...(cut)... (attachment)
When temporarily disabled* the icon works. And who can now reconcile the work of these two programs (Event Gallery and Phoca Open Grafh)?
* System - Phoca Open Graph Plugin 3.0.2 17/01/2017