find_optimal_dimensions_for_microstrip_coupler: 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 Debian possible default full paths are:

/usr/bin/find_optimal_dimensions_for_microstrip_coupler - from package: atlc

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

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