ionic platform configure error : ubuntu

I am using Ubuntu 14.04. I am trying to configure Ionic Framework. When I am trying to configure the platform for Android, I get the following error.

  /home/sameera/.cordova/lib/android/cordova/3.5.1/bin/node_modules/q/q.js:126
                throw e;
                      ^
  Error: An error occurred while listing Android targets
  at /home/sameera/.cordova/lib/android/cordova/3.5.1/bin/lib/check_reqs.js:87:29
  at _rejected (/home/sameera/.cordova/lib/android/cordova/3.5.1/bin/node_modules/q/q.js:808:24)
  at /home/sameera/.cordova/lib/android/cordova/3.5.1/bin/node_modules/q/q.js:834:30
  at Promise.when (/home/sameera/.cordova/lib/android/cordova/3.5.1/bin/node_modules/q/q.js:1079:31)
  at Promise.promise.promiseDispatch (/home/sameera/.cordova/lib/android/cordova/3.5.1/bin/node_modules/q/q.js:752:41)
  at /home/sameera/.cordova/lib/android/cordova/3.5.1/bin/node_modules/q/q.js:574:44
  at flush (/home/sameera/.cordova/lib/android/cordova/3.5.1/bin/node_modules/q/q.js:108:17)
  at process._tickCallback (node.js:419:13)
  Error: /home/sameera/.cordova/lib/android/cordova/3.5.1/bin/create: Command failed with exit code 8
  at ChildProcess.whenDone (/usr/local/lib/node_modules/cordova/node_modules/cordova-lib/src/cordova/superspawn.js:135:23)
  at ChildProcess.emit (events.js:98:17)
  at maybeClose (child_process.js:756:16)
  at Process.ChildProcess._handle.onexit (child_process.js:823:5)

I also added Android to the PATH like below:

  export PATH=${PATH}:~/home/sameera/Downloads/Softwares/android-studio/sdk/tools
  export PATH=${PATH}:~/home/sameera/Downloads/Softwares/android-studio/sdk/platform-tools