Help debugging error 2830

Help debugging error 2830

Hopefully someone here can help.

I'm using Zoho Creator & the API to insert some data into an application.

All seems fine - accept when i attempt to add this value

<field name="referrer"><value>www.centralstation.com.au/search/results.asp|cx=000956394664824970001%3A0izazm-6ft4|cof=FORID%3A9|q=wild volume 15</value></field>

I get:
<response><errorlist><error><code>2830</code><message>XML document structures must start and end within the same entity.</message></error></errorlist></response>

if i remove this particular value - it adds ok.