Whats wrong in the script

PowerCLI C:\> Get-VM -Name (Get-Content vmnames.txt) |Select-Object Name,@{N="HardDiskSizeGB"; E={(Get-HardDisk -VM $_ | Measure-Object -Sum CapacityGB).Sum}}

Get-VM : Cannot validate argument on parameter 'Name'. The argument is null or empty. Provide an argument that is not null or empty, and then try the command again.

At line:1 char:14

+ Get-VM -Name (Get-Content vmnames.txt) |Select-Object Name,@{N="HardD ...

+              ~~~~~~~~~~~~~~~~~~~~~~~~~

    + CategoryInfo          : InvalidData: (:) [Get-VM], ParameterBindingValidationException

    + FullyQualifiedErrorId : ParameterArgumentValidationError,VMware.VimAutomation.ViCore.Cmdlets.Commands.GetVM