I have an issue on Twtter sharing, I'm unable to share pages of my site, on Twitter card validator I have this log:
INFO: Page fetched successfully
INFO: 10 metatags were found
WARN: Not whitelisted
PS : All Twitter meta tags exist.
Resolved. The problem was on my code. If any one has the same issue, you will need to check if you have any null value on you code.