Powershell and sharepoint and updatelistitems() exception

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http://serverfault.com – I've got an issue where I keep getting "Exception calling "UpdateListItems" with "2" argument(s): "Exception of type 'Microsoft.SharePoint.SoapServer.SoapServerException' was thrown." whenever I call $service.updatelistitems($listname, $xml). I've scoured the Net and see some people having similar issues. My sharepoint list is called Autos and has the Title field renamed to Make and an additional field name Model, both simple string fields. Does anybody know why I can't update my list? Reading the list works just fine. $uri = 'http://myServerName/sandbox/_vti_bin/lists.asmx?wsdl' (HowTos)