SOLVED: heat.engine.resource Error: Creation of server my-wordpress-stack-WikiDatabase-wkamhzaov7z3 failed: No valid host was f ound. (500)

Error
=====
2014-04-18 10:59:10.500 ERROR heat.engine.resource [-] CREATE : Instance "WikiDatabase"
2014-04-18 10:59:10.500 TRACE heat.engine.resource Traceback (most recent call last):
2014-04-18 10:59:10.500 TRACE heat.engine.resource   File "/opt/stack/heat/heat/engine/resource.py", line 371, in _do_action
2014-04-18 10:59:10.500 TRACE heat.engine.resource     while not check(handle_data):
2014-04-18 10:59:10.500 TRACE heat.engine.resource   File "/opt/stack/heat/heat/engine/resources/instance.py", line 372, in check_create_complete
2014-04-18 10:59:10.500 TRACE heat.engine.resource     return self._check_active(cookie)
2014-04-18 10:59:10.500 TRACE heat.engine.resource   File "/opt/stack/heat/heat/engine/resources/instance.py", line 398, in _check_active
2014-04-18 10:59:10.500 TRACE heat.engine.resource     raise exc
2014-04-18 10:59:10.500 TRACE heat.engine.resource Error: Creation of server my-wordpress-stack-WikiDatabase-wkamhzaov7z3 failed: No valid host was f
ound.  (500)
2014-04-18 10:59:10.500 TRACE heat.engine.resource

Fix
===
* Try again with higher flavor/instancetype.
* Use Following command to find flavors
#nova flavor-list