rmccmt: 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/rmccmt - from package: liwc

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

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