evince-thumbnailer: 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/evince-thumbnailer - from package: evince

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

On Debian possible default full paths are:

/usr/bin/evince-thumbnailer - from package: evince-gtk
/usr/bin/evince-thumbnailer - from package: evince

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

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