Creating ionic application error

While i create new ionic app it throws below error any one please help to solve this issue


C:\Users\USER\AppData\Roaming\npm\node_modules\ionic\node_modules\rx-lite\rx.lit
e.js:2107
 $  function ToArrayObservable(source) {
    ^^^^^^^^

SyntaxError: Unexpected token function
    at createScript (vm.js:56:10)
    at Object.runInThisContext (vm.js:97:10)
    at Module._compile (module.js:542:28)
    at Object.Module._extensions..js (module.js:579:10)
    at Module.load (module.js:487:32)
    at tryModuleLoad (module.js:446:12)
    at Function.Module._load (module.js:438:3)
    at Module.require (module.js:497:17)
    at require (internal/module.js:20:19)
    at Object.factory.call.Observable (C:\Users\USER\AppData\Roaming\npm\node_mo
dules\ionic\node_modules\rx-lite-aggregates\rx.lite.aggregates.js:28:52)