[VE][108] Add Subject Here

Hello

 

I check and get error in Line 7, Column 18: there is no attribute "property"

  <meta property="og:locale" content="vi_VN" />

 

I do not know how to fix it. Please guide me to fix it

Validating http://xaydunglala.com/ 
Error [108]: "there is no attribute X"