CLI command issues just after installing ionic lab

I solved the problem

Updated nodejs to latest version 4.2.3 . It work fine. But there is a warning in CLI. This occurs when nodejs version is less than 0.12.x , but my version is 4.2.3 .Here is the warning:

Upgrade warning - for the CLI to run correctly,
it is highly suggested to upgrade the following:
Please update your Node runtime to version  >=0.12.x