[fw-webservices] Debugging Zend_XmlRpc_Server

I have my server and client both basically working on a "hello world" level.
Now I'm trying to add the good stuff. The problem is that I'll change
something in my web service, and get an exception like this:

( ! ) Warning: SimpleXMLElement::__construct()
[function.SimpleXMLElement---construct]: Entity: line 2: parser error :
Extra content at the end of the document in
/data/lib/Zend/ZendFramework-1.10.2/library/Zend/XmlRpc/Response.php on line
180
Call Stack
# Time Memory Function Location
1 0.0003 60988 {main}( ) ../xmlrpc_test.php:0
2 0.1881 10109712 Zend_XmlRpc_Client->call( ) ../xmlrpc_test.php:24
3 0.9383 10836620 Zend_XmlRpc_Client->doRequest( ) ../Client.php:364
4 1.6136 10845916 Zend_XmlRpc_Response->loadXml( ) ../Client.php:300
5 1.6137 10845916 SimpleXMLElement->__construct( ) ../Response.php:180

When I print_r on $response from within the loadXml() function, it looks
like this:

faultCode623faultStringCalling parameters do not match signature

But if I take out the offending line of code then it doesn't complain about
parameters. I am trying to create a DatabaseObject, which is my custom
"interface with mySQL" class. There might be an error creating the
DatabaseObject (maybe the database isn't configured correctly or something
else), but that's the error I need to see, not "Calling parameters do not
match signature"

I tried the advice from this thread,
http://osdir.com/ml/php.zend.framework.general/2007-06/msg00383.html , but
it looks like the exception is thrown before I can get any useful
information into the log.

Any suggestions for me?
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