Error occurs when inserting google tag manager code to blogspot template: Error parsing XML, line 1999, column 45: The reference to entity "l" must end with the ';' delimiter. Hide notification How to fix: Change this (third) line: j=d.createElement(s),dl=l!='dataLayer'?' & l='+l:'';j.async=true;j.src= To: j=d.createElement(s),dl=l!='dataLayer'?' & l='+l:'';j.async=true;j.src=
Practice until you can't make it wrong.