validator complaining about &

From: Kevin Bryan <kevin@sane.com> Date: Mon, 10 Sep 2001 09:50:21 -0400 (EDT) To: <www-validator@w3.org> Message-ID: <PDELKBKKIOKCLALMCBEDMEIHCAAA.kevin@sane.com> · This archive was generated by hypermail 2.4.0 : Friday, 17 January 2020 22:58:23 UTC

I'm getting this error on a page uploaded to validator.w3.org.  I don't
quote understand why as this is exactly what it suggested I put there.

...?referrer=yahoo&amp;category=Education
                   ^
Error: unknown entity "amp" (explanation...)

I have recently also gotten the error with &nbsp;.  Is entity checking
working?

Please use 'Reply to all', or reply directly to me, as I am not on this
mailing list.

--Kevin

validator complaining about &amp;