While we are adding Google Tag Manager into our site, sometimes we may face an error like below. (For security purposes I will not share any screenshot in this article.)
org.xml.sax.SAXParseException; lineNumber: 9; columnNumber: 43; The reference to entity “l” must end with the ‘;’ delimiter.
To fix this watch the error carefully. Find the lineNumber of this error. In my case the lineNumber is 9. So, in lineNumber 9 seach for &l= and replace this with &=
Now save this. Insha-Allah now your Google Tag Manager will be successfully added.