Before I talk about the error message, I need to say THANK YOU, DMITRI whoever you are! ;) I think this is the counter I've been waiting for since NPhero died.
Anyway, there's a closing quotation mark missing from the browseshop part of the code.
I also found the instructions just a bit confusing to follow. Can I suggest you make it like this:
[quote]Your Counter Code
PERSONAL SHOP BANNER:
< img src="http://shops.neomallers.com/NEOMALLERSNAME.gif">
Your full shop banner code should be in this format:
< a href ="/browseshop.phtml?ownerNEOPETSUSERNAME=&banner">
... etc[/quote]
The bold parts are what I added or changed. Something like that, anyway.