Flows are in PENDING_ADD state in ONOS

When flows are added to the devices from ONOS, the state in ONOS show then in the PENDING_ADD state as follows:

onos> flows
deviceId=of:00005c022e231977, flowRuleCount=2
id=10000bcc19c56, state=PENDING_ADD, bytes=0, packets=0, duration=0, liveType=UNKNOWN, priority=40000, tableId=0, appId=org.onosproject.core, payLoad=null, selector=[ETH_TYPE:arp], treatment=DefaultTrafficTreatment

{immediate=[OUTPUT:CONTROLLER], deferred=[], transition=None, meter=[], cleared=true, StatTrigger=null, metadata=null}

id=10000e51f2149, state=PENDING_ADD, bytes=0, packets=0, duration=0, liveType=UNKNOWN, priority=40000, tableId=0, appId=org.onosproject.core, payLoad=null, selector=[ETH_TYPE:eapol], treatment=DefaultTrafficTreatment

{immediate=[OUTPUT:CONTROLLER], deferred=[], transition=None, meter=[], cleared=true, StatTrigger=null, metadata=null}

deviceId=of:0000aabbccddeeff, flowRuleCount=0