chemeq_error: 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_error - from package: wims

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

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