Getting "Invalid size: medium. Acceptable values are small" while allocating a medium size gear to an application

Issue

• As per OpenShift Documentation while changing the default gear size to "medium" added node_profile="medium" in the /etc/openshift/resource_limits.conf and made below entry in /etc/openshift/broker.conf :

VALID_GEAR_SIZES="medium"
DEFAULT_GEAR_CAPABILITIES="medium"
DEFAULT_GEAR_SIZE="medium"

However this seems not working.