Enable Adblock Plus with EasyList (default)
Install Google Publisher Toolbar :
https://chrome.google.com/webstore/detail/google-publisher-toolbar/omioeahgfecgfpfldejlnideemfidnkc
Activate adsense account On Publisher Toolbar,
Open Publisher Toolbar
"Error Fetching Publisher Data"
it was okay on couple weeks / months before, Ads blocked and Google Publisher Toolbar Working perfectly, but now its error.