eval_octree_accuracy: 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/eval_octree_accuracy - from package: octomap

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

On Debian possible default full paths are:

/usr/bin/eval_octree_accuracy - from package: octomap-tools

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

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