[Cppcms-users] HTTP 500 errors - backend died?

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Hi, I am having problems getting any CppCMS applications to run. (Running CppCMS 0.0.4 on Ubuntu 8.10 x86)
Any requests get a HTTP 500 error. Have tried lighttpd and apache - the only difference is that lighttpd gives some debugging output (shown below).

Here is the output when running the "hello world" example:

$ cppcms_run hello.fcgi -c config.txt 
Web Server Host:127.0.0.1
Web Server Port:8080
Document Root:/<removed>/cppcms/examples-0.0.4/hello_world
Script:/hello.fcgi
Api:fastcgi
Socket:/tmp/hello-world.sock
Server:/usr/sbin/lighttpd -f /<removed>/cppcms/examples-0.0.4/hello_world/cppcms_rundir/lighty.conf
Starting Application Server:/hello.fcgi
X-Powered-By: cppcms/0.0.4
Content-Length: 53
Content-Type: text/html

<html>
<body>
  <h1>Hello World</h1>
</body>
</html>
Application Server PID:11871
Starting Web Server
2009-02-22 20:41:33: (log.c.75) server started 
Web Server PID:11874

------------------------------------
- Press Any Key To Stop The Server -
------------------------------------
2009-02-22 20:41:42: (mod_fastcgi.c.1761) connect failed: No such file or directory on unix:/tmp/hello-world.sock 
2009-02-22 20:41:42: (mod_fastcgi.c.2930) backend died; we'll disable it for 5 seconds and send the request to another backend instead: reconnects: 0 load: 1 
2009-02-22 20:41:48: (mod_fastcgi.c.2743) fcgi-server re-enabled: unix:/tmp/hello-world.sock 

The last few lines repeat each time a request is made from the browser. From my investigation it seems that the "app.execute()" line is falling through, generating one batch of output and then the application quits.

Any ideas?