Unable to copy files to remotely server

PowerShell Help
1 
$s=New-PSSession -ComputerName (Import-Csv c:\1.csv).hostname

   Copy-Item -Path C:\ibm\BESRemove.exe -Destination C:\ibm\BESRemove.exe -Recurse  -Force -ToSession  $s
   Copy-Item -Path C:\ibm\treesizefree.exe -Destination C:\ibm\treesizefree.exe -Recurse  -Force -ToSession  $s

error report:

Copy-Item : Cannot convert ‘System.Object’ to the type ‘System.Management.Automation.Runspaces.PSSession’ required by parameter ‘ToSession’. Speci
fied method is not supported.
Please help.Thank you.

2

This issue is resolved,thank you.