Why “ionic serve” fails?

 ionic serve

5.2.0rror: Invalid Version: Le fichier sp�cifi� est introuvable.

at new SemVer (C:\Users\ramadan\AppData\Roaming\npm\node_modules\ionic\node_modules\semver\semver.js:295:11)
at Range.test (C:\Users\ramadan\AppData\Roaming\npm\node_modules\ionic\node_modules\semver\semver.js:1049:15)
at Function.satisfies (C:\Users\ramadan\AppData\Roaming\npm\node_modules\ionic\node_modules\semver\semver.js:1098:16)
at Object.checkRuntime (C:\Users\ramadan\AppData\Roaming\npm\node_modules\ionic\node_modules\ionic-app-lib\lib\info.js:295:32)
at Object.run (C:\Users\ramadan\AppData\Roaming\npm\node_modules\ionic\lib\cli.js:54:10)
at Object.<anonymous> (C:\Users\ramadan\AppData\Roaming\npm\node_modules\ionic\bin\ionic:9:10)
at Module._compile (module.js:460:26)
at Object.Module._extensions..js (module.js:478:10)
at Module.load (module.js:355:32)
at Function.Module._load (module.js:310:12)
at Function.Module.runMain (module.js:501:10)
at startup (node.js:129:16)
at node.js:814:3

5.2.0id Version: Le fichier sp�cifi� est introuvable.
(CLI v1.6.4)

Your system information:

5.2.0va CLI: Le fichier sp�cifi� est introuvable.

Ionic Version: 1.0.0-rc.1
Ionic CLI Version: 1.6.4
Ionic App Lib Version: 0.3.8
OS: Windows 8
Node Version: v0.12.7