Invoke-Command with FilePath and ArgumentList

i have written following line of code

invoke-command -filepath 'c:\program files\microsoft data protection manager\dpm\bin\attach-productionserver.ps1' -argumentlist ($dpmservername, $servername, $cred.username, $cred.password)

 

i error

invoke-command : parameter set cannot resolved using specified named parameters.

http://stackoverflow.com/questions/4225748/how-do-i-pass-named-parameters-with-invoke-command

Windows Server  >  Windows PowerShell