icon-name-mapping: 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/icon-name-mapping - from package: icon-naming-utils

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

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