[VE][64] document type does not allow element "div" here, [108] there is no attibute "onerror"

Hello, 2 questions why is div not allowed in the script, and has "onerror"
JavaScript instruction deprecated or something like that?

 

Thanks in advance.

Validating  <http://sarahelengornrealestate.com/front-end.php>
http://sarahelengornrealestate.com/front-end.php 
Error [64]: "document type does not allow element X here" 

Validating  <http://sarahelengornrealestate.com/front-end.php>
http://sarahelengornrealestate.com/front-end.php 
Error [108]: "there is no attribute X"