chemeq_n: 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:

/var/lib/wims/public_html/bin/chemeq_n - from package: wims

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

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