ct_run: 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/lib64/erlang/bin/ct_run - from package: erlang-erts
/usr/lib64/erlang/erts-5.8.5/bin/ct_run - from package: erlang-erts

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

On Debian possible default full paths are:

/usr/bin/ct_run - from package: erlang-common-test
/usr/lib/erlang/bin/ct_run - from package: erlang-common-test
/usr/lib/erlang/erts-6.2/bin/ct_run - from package: erlang-common-test
/usr/lib/debug/usr/lib/erlang/bin/ct_run - from package: erlang-dbg
/usr/lib/debug/usr/lib/erlang/erts-6.2/bin/ct_run - from package: erlang-dbg

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

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