Iscsi configuration error : Could not create networkportal in ConfigFS

I'm listing one of the recent issues while configuring iscsi disk. Let me know if you find any leads in resolving this. My disk configuration looks like below. While creating a portal with ip address, I get an error as listed below. Without my portal being defined on ip address, I beleive I cannot link my initiator (let me know if I'm wrong)

/iscsi/iqn.2015-03.internal.compute.us-west-2:ip-172-31-25-174/tpg1/portals create 172.31.25.174
Using default IP port 3260

Could not create NetworkPortal in configFS.

/> ls
o- / .................................................................................... [...]
o- backstores ......................................................................... [...]
| o- block ............................................................. [Storage Objects: 1]
| | o- data1 ................................... [/dev/xvdf1 (5.0GiB) write-thru deactivated]
| o- fileio ............................................................ [Storage Objects: 0]
| o- pscsi ............................................................. [Storage Objects: 0]
| o- ramdisk ........................................................... [Storage Objects: 0]
o- iscsi ....................................................................... [Targets: 1]
| o- iqn.2015-03.internal.compute.us-west-2:ip-172-31-25-174 ...................... [TPGs: 1]
| o- tpg1 .......................................................... [no-gen-acls, no-auth]
| o- acls ..................................................................... [ACLs: 1]
| | o- iqn.2015-03.internal.compute.us-west-2:ip-172-31-29-38 .......... [Mapped LUNs: 0]
| o- luns ..................................................................... [LUNs: 0]
| o- portals ............................................................... [Portals: 1]
| o- 0.0.0.0:3260 ................................................................ [OK]
o- loopback .................................................................... [Targets: 0]
/>

Thanks,