Exchange 2007 Command failed with an exception

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PowerShell

Exchange-Server

Hi All,

I was trying to execute following exchange server 2007 (powershell) command.

$server='exchangeserver.abc.local';$pwd= convertto-securestring '123' -asplaintext -force;$cred=new-object -typename System.Management.Automation.PSCredential -argumentlist 'Administrator',$pwd; invoke-command -computername $server -credential $cred -scriptblock {Add-PSSnapin Microsoft.Exchange.Management.PowerShell.Admin; get-mailbox Administrator}

But landed in the following exception...

Processing data for a remote command failed with the following error message: The WSMan provider host process did not return a proper response.  
A provider in the host process may have behaved improperly. For more information, see the about_Remote_Troubleshooting Help topic.
    + CategoryInfo             : OperationStopped:                                                    
                                 System.Manageme...pressionSyncJob:PSInvokeExpressionSyncJob) [],
                                 PSRemotingTransportException
    + FullyQualifiedErrorId    : JobFailure

I have tried it in both powershell 1.0 & 2.0

Any help on this would be great.

Regards
Sebastian