Get-FASTSearchContentCollection Error Message

When execute Get-FASTSearchContentCollection -Name "sp"
Get the following error message: Get-FASTSearchContentCollection : Failed to communicate with the WCF service.

I was running the PowerShell window as administrator. However I need to run the PowerShell window with FAST user account. To access "Run as different user", hold down the Shift key while right - click the "Microsoft FAST Search Server 2010 for SharePoint".

Thanks to Corey Roth for the solution!