AI error message: Could not obtain valid install manifest

Hello,

Could you, please, put some light on why I'm getting this error message?

The client (a test X86 VBox) can boot but gets stuck at the following point:

...
Configuring devices.
Hostname: solaris
Service discovery phase initiated
Service name to look up: default_ai
Service discovery finished successfully
Process of obtaining install manifest initiated
Could not obtain valid install manifest

On the AI server, the service, manifest and criteria were all sucessfully created:

# ...
# installadm create-manifest -n default_ai \
      -f /var/tmp/manifests/default_ai.xml \
      -C /var/tmp/manifests/criteria_default_ai.xml

# installadm list -m -n default_ai
...

criteria_default_ai.xml