hotshot2calltree: 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/hotshot2calltree - from package: kdesdk

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

On Debian possible default full paths are:

/usr/bin/hotshot2calltree - from package: kcachegrind-converters

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

Error in other languages:
hotshot2calltree: bevel nie gevind nie
hotshot2calltree: comandă negăsită
hotshot2calltree: comando não encontrado
hotshot2calltree: commande introuvable
hotshot2calltree: command not found
hotshot2calltree: käsku ei ole
hotshot2calltree: không tìm thấy lệnh
hotshot2calltree: komanda nerasta
hotshot2calltree: Kommando nicht gefunden.
hotshot2calltree: kommandot finns inte
hotshot2calltree: komut yok
hotshot2calltree: nie znaleziono polecenia
hotshot2calltree: níor aimsíodh an t-ordú
hotshot2calltree: no se encontró la orden
hotshot2calltree: no s'ha trobat l'ordre
hotshot2calltree: opdracht niet gevonden
hotshot2calltree: parancs nem található
hotshot2calltree: perintah tidak ditemukan
hotshot2calltree: príkaz nenájdený
hotshot2calltree: příkaz nenalezen
hotshot2calltree: команда не найдена
hotshot2calltree: командата не е открита
hotshot2calltree: 命令找不到
hotshot2calltree: コマンドが見つかりません