tandem2pin: 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/tandem2pin - from package: percolator

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

Error in other languages:
tandem2pin: bevel nie gevind nie
tandem2pin: comandă negăsită
tandem2pin: comando não encontrado
tandem2pin: commande introuvable
tandem2pin: command not found
tandem2pin: käsku ei ole
tandem2pin: không tìm thấy lệnh
tandem2pin: komanda nerasta
tandem2pin: Kommando nicht gefunden.
tandem2pin: kommandot finns inte
tandem2pin: komut yok
tandem2pin: nie znaleziono polecenia
tandem2pin: níor aimsíodh an t-ordú
tandem2pin: no se encontró la orden
tandem2pin: no s'ha trobat l'ordre
tandem2pin: opdracht niet gevonden
tandem2pin: parancs nem található
tandem2pin: perintah tidak ditemukan
tandem2pin: príkaz nenájdený
tandem2pin: příkaz nenalezen
tandem2pin: команда не найдена
tandem2pin: командата не е открита
tandem2pin: 命令找不到
tandem2pin: コマンドが見つかりません