tkconch: 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 CentOS possible default full paths are:

/usr/bin/tkconch - from package: python-twisted-conch

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/tkconch - from package: python-twisted-conch

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

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