amcrypt-ossl: 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/sbin/amcrypt-ossl - from package: amanda-server

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

On Debian possible default full paths are:

/usr/sbin/amcrypt-ossl - from package: amanda-common

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

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