DictionaryReader: 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/DictionaryReader - from package: dictionaryreader.app

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

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