The command should be stand-alone, not part of a "sentence":
```
Enable-WindowsOptionalFeature : A positional parameter cannot be found that accepts argument '.'.
At line:1 char:1
+ Enable-WindowsOptionalFeature -Online -FeatureName Microsoft-Hyper-V ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidArgument: (:) [Enable-WindowsOptionalFeature], ParameterBindingException
+ FullyQualifiedErrorId : PositionalParameterNotFound,Microsoft.Dism.Commands.EnableWindowsOptionalFeatureCommand
```
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