[1.10main-2209 ] Unable to disassociate a policy from a VN thru webui

1]. A policy 'pol2' is already attached to virtual-network , 'vn3'.
2]. I'm trying to delete this policy 'pol2' from 'vn3' and see the following error cropping up:

Internal Server Error

Virtual-Network(default-domain:admin:vn3) has invalid subnet(30.30.30.0/24)

3]. contrail-webui.log shows the following :

2014-06-19T08:35:25.763Z - ^[[34mdebug^[[39m: In updateFloatingIpList(): JSON Parse error:TypeError: Cannot read property 'length' of undefined
2014-06-19T08:35:25.790Z - ^[[31merror^[[39m: URL [http://33.33.33.4:9100/virtual-network/1acc577b-a0a6-40b1-8e13-e2f9b8eb803d] returned error ["Virtual-Network(default-domain:admin:vn3) has invalid subnet(30.30.30.0/24)"]
2014-06-19T08:35:25.792Z - ^[[31merror^[[39m: REST Server Error: Virtual-Network(default-domain:admin:vn3) has invalid subnet(30.30.30.0/24)
    at APIServer.retryMakeCall (/usr/src/contrail/contrail-web-core/src/serverroot/common/rest.api.js:169:13)
    at EventEmitter.APIServer.makeCall (/usr/src/contrail/contrail-web-core/src/serverroot/common/rest.api.js:280:18)
    at EventEmitter.emit (events.js:99:17)
    at EventEmitter.mixin._fireSuccess (/usr/lib64/node_modules/restler/lib/restler.js:211:10)
    at mixin._responseHandler (/usr/lib64/node_modules/restler/lib/restler.js:152:20)
    at IncomingMessage.parsers.auto (/usr/lib64/node_modules/restler/lib/restler.js:368:7)
    at EventEmitter.mixin._encode (/usr/lib64/node_modules/restler/lib/restler.js:192:29)
    at mixin._responseHandler (/usr/lib64/node_modules/restler/lib/restler.js:148:16)
    at EventEmitter.mixin._decode (/usr/lib64/node_modules/restler/lib/restler.js:164:7)
    at IncomingMessage.mixin._responseHandler (/usr/lib64/node_modules/restler/lib/restler.js:141:14)
2014-06-19T08:48:50.910Z - ^[[34mdebug^[[39m: In updateFloatingIpList(): JSON Parse error:TypeError: Cannot read property 'length' of undefined
2014-06-19T08:48:50.936Z - ^[[31merror^[[39m: URL [http://33.33.33.4:9100/virtual-network/1acc577b-a0a6-40b1-8e13-e2f9b8eb803d] returned error ["Virtual-Network(default-domain:admin:vn3) has invalid subnet(30.30.30.0/24)"]
2014-06-19T08:48:50.937Z - ^[[31merror^[[39m: REST Server Error: Virtual-Network(default-domain:admin:vn3) has invalid subnet(30.30.30.0/24)
    at APIServer.retryMakeCall (/usr/src/contrail/contrail-web-core/src/serverroot/common/rest.api.js:169:13)
    at EventEmitter.APIServer.makeCall (/usr/src/contrail/contrail-web-core/src/serverroot/common/rest.api.js:280:18)
    at EventEmitter.emit (events.js:99:17)
    at EventEmitter.mixin._fireSuccess (/usr/lib64/node_modules/restler/lib/restler.js:211:10)
    at mixin._responseHandler (/usr/lib64/node_modules/restler/lib/restler.js:152:20)
    at IncomingMessage.parsers.auto (/usr/lib64/node_modules/restler/lib/restler.js:368:7)
    at EventEmitter.mixin._encode (/usr/lib64/node_modules/restler/lib/restler.js:192:29)
    at mixin._responseHandler (/usr/lib64/node_modules/restler/lib/restler.js:148:16)
    at EventEmitter.mixin._decode (/usr/lib64/node_modules/restler/lib/restler.js:164:7)
    at IncomingMessage.mixin._responseHandler (/usr/lib64/node_modules/restler/lib/restler.js:141:14)