Open Stack

Hello,
I am trying to integrate the Ironic service with other openstack services.
I am using liberty release of openstack.

installed and configured the Ironic service.
here is the setup:

1: all openstack services are deployed on VM
2: controller is on one VM (along with other services) and compute is on
another VM
3: one bare metal machine / desktop is there which i want to provision
using the ironic service.
4: nova compute service which runs on compute node is serving hypervisor
for VMs and another nova compute service which is running on controller is
acting hypervisor for bare metal node ...
5: so actually i have hybrid model of VMs and physical server for openstack
private cloud.
6: i am using pxe_wol driver to boot the node. using ironic service also i
can boot the node.

so, this is the brief about the environment setup which i have as of now ...
the issue is , when i am trying to launch the instance from horizon
dashboard .. i am getting above error

in the scheduler log, here is the output.

2016-05-11 09:17:30.529 15559 INFO nova.filters
[req-6c68100d-420f-43ad-878e-7819a43298e6 5c50e3803049470283f7a9d18e871096
28d5644376ba4d3bab3a30e09a0b28d1 - - -] Filter ExactRamFilter returned 0
hosts
2016-05-11 09:17:30.530 15559 INFO nova.filters
[req-6c68100d-420f-43ad-878e-7819a43298e6 5c50e3803049470283f7a9d18e871096
28d5644376ba4d3bab3a30e09a0b28d1 - - -] Filtering removed all hosts for the
request with reservation ID 'r-mld1goh8' and instance ID
'98c49d72-9d8e-4377-bbe0-6dbef187e75a'. Filter results: ['RetryFilter:
(start: 3, end: 3)', 'AvailabilityZoneFilter: (start: 3, end: 3)',
'ComputeFilter: (start: 3, end: 3)', 'ComputeCapabilitiesFilter: (start: 3,
end: 3)', 'ImagePropertiesFilter: (start: 3, end: 3)', 'ExactRamFilter:
(start: 3, end: 0)']

now i dont understand what is the meaning of "ExactRamFilter  returned 0
hosts"

please help

Regards,
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