This error was causing multiple blocks to be shown on a page.
Since the setting doesn’t work with this error anyway, you can uncheck “Block right click” in the Flickr Justified Gallery settings. to fix the error. That prevents the loaded script from attempting to call the undefined method.
“If enabled, the context menu will be blocked, so for the user is more difficult to save the images
You can use the block_contextmenu attribute to change this default value (with the value true or false)”
A list of 6 things this plugins need and still 5 stars?
I am seeing the same error on the XML-Sitemap config page, but when I clicked through to see the ‘failed’ results all 3 had the success message or xml.
I think it may be an issue parsing the responses from the search engines after a successful submit.
You could try viewing the lines in the error output and see if you can dump or log the response on error. My guess is that it may be passing.
