vimdot: 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/vimdot - from package: graphviz

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

On Debian possible default full paths are:

/usr/bin/vimdot - from package: graphviz

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

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