winswitch_command_wrapper: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/winswitch_command_wrapper - from package: winswitch

You may install the required package with command apt-get install {package}

Error in other languages:
winswitch_command_wrapper: bevel nie gevind nie
winswitch_command_wrapper: comandă negăsită
winswitch_command_wrapper: comando não encontrado
winswitch_command_wrapper: commande introuvable
winswitch_command_wrapper: command not found
winswitch_command_wrapper: käsku ei ole
winswitch_command_wrapper: không tìm thấy lệnh
winswitch_command_wrapper: komanda nerasta
winswitch_command_wrapper: Kommando nicht gefunden.
winswitch_command_wrapper: kommandot finns inte
winswitch_command_wrapper: komut yok
winswitch_command_wrapper: nie znaleziono polecenia
winswitch_command_wrapper: níor aimsíodh an t-ordú
winswitch_command_wrapper: no se encontró la orden
winswitch_command_wrapper: no s'ha trobat l'ordre
winswitch_command_wrapper: opdracht niet gevonden
winswitch_command_wrapper: parancs nem található
winswitch_command_wrapper: perintah tidak ditemukan
winswitch_command_wrapper: príkaz nenájdený
winswitch_command_wrapper: příkaz nenalezen
winswitch_command_wrapper: команда не найдена
winswitch_command_wrapper: командата не е открита
winswitch_command_wrapper: 命令找不到
winswitch_command_wrapper: コマンドが見つかりません