Hi Mahesh,
In order to troubleshoot the issue, can you tell me what goal you are trying to achieve by running this PowerShell?
Moreover, this is an Exchange PowerShell. Please click on the link below to learn how to connect Windows PowerShell to Office 365 and then run the cmdlet to check whether the issue still exists or not.
http://help.outlook.com/en-us/140/cc952755.aspx
Thanks,
Yang Yu