as descibed here: 
https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.core/get-pssession?view=powershell-6

Get-PSSession : The term 'New-WSManSessionOption' is not recognized as the name of a cmdlet, function, script file, or operable program.
Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
At line:1 char:1
+ Get-PSSession -ComputerName "localhost"
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo          : ObjectNotFound: (New-WSManSessionOption:String) [Get-PSSession], CommandNotFoundException
+ FullyQualifiedErrorId : CommandNotFoundException,Microsoft.PowerShell.Commands.GetPSSessionCommand