WinTabs: 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/WinTabs - from package: afterstep

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

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