Introspection time out

Hi Guys,
I doing an OSP 16 deployment and I have done up to undercloud installation. In my case controller and computes are virtual machine in kvm. while doing introspection getting following timeout error
I

ntrospection of node completed:d1e6da5b-8c3d-432b-a989-f15c20f6c600. Status:FAILED. Errors:Introspection
An exception occurred while waiting for messages. This can indicate a timeout or a failure in the workflow execution. To troubleshoot, check the workflow executions for failures and/or the ansible logs. Exception: ValueError("No JSON object could be decoded; ''"
console is showing as per attachment. please suggest on this