What is this XML error?

You can Edit the corresponding Record by the below formula

"https://[YourDomain]/db/?a=er&rid="&[Record ID#]&"&apptoken=[apptoken]"

Just Fill

YourDomain eg:  aaa.com
tableid: seen in the url of table after db
apptoken: On app management Require application token and create a token.

just remove square brackets