Error while adding cordova platform ios -

Error while adding cordova platform ios -

i update cordova version 3.6.0 4.0.0, latest 1 on today's date. allow add together me android platform while going add together ios platform gives next error.

unable fetch platform ios: error: no compatible version found: cordova-ios@'>=8458588.0.0-0 <8458589.0.0-0' valid install targets: ["3.5.0","3.6.0","3.6.1","3.6.3"]

i have xcode6 install on system. can't figure out problem.

i solve problem, re installing cordova using command $ sudo npm install -g cordova

cordova cordova-3