Unable to add domain user as sysadmin in SQL Server 2012 using PowerShell

Hi,

I am using the following PowerShell script to add a domain user to SQL Server 2012 as sysadmin, but I encounter an exception.

[System.Reflection.Assembly]::LoadWithPartialName('Microsoft.SqlServer.SMO') | out-null; $svr = New-Object ('Microsoft.SqlServer.Management.Smo.Server') "SQL2012"; $svrole = $svr.Roles | where {$_.Name -eq 'sysadmin'}; $svrole.AddMember("domainname\username");

The exception it throws is as follows:

Exception calling "AddMember" with "1" argument(s): "Add member failed for ServerRole 'sysadmin'. "
At line:1 char:237
+ [System.Reflection.Assembly]::LoadWithPartialName('Microsoft.SqlServer.SMO') | out-null; $svr = New-Object ('Microsof
t.SqlServer.Management.SMO.Server') "SQL2012"; $svrole = $svr.Roles | where {$_.Name -eq 'sysadmin'}; $svrole.AddMember
 <<<< ("domainname\username");
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : DotNetMethodException

Please could someone possibly help?

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