character "" not allowed in prolog

[arvgta]

Hello all,

I'm debugging this page: http://www.oeko-fakt.de/produkte/

In the W3 validator, it shows me the above error.

When I have a look at the post-load DOM in Firebug, it is absolutely distorted.

Do these two have anything to do with each other?
How can I get rid to the error?


Thanks in advance and kind regards

[arvgta]

Solved - it was presumably the "byte order mark" (BOM), which I removed with Notepad++