uwsgi_sqlite3: 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/uwsgi_sqlite3 - from package: uwsgi-plugin-sqlite3

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

Error in other languages:
uwsgi_sqlite3: bevel nie gevind nie
uwsgi_sqlite3: comandă negăsită
uwsgi_sqlite3: comando não encontrado
uwsgi_sqlite3: commande introuvable
uwsgi_sqlite3: command not found
uwsgi_sqlite3: käsku ei ole
uwsgi_sqlite3: không tìm thấy lệnh
uwsgi_sqlite3: komanda nerasta
uwsgi_sqlite3: Kommando nicht gefunden.
uwsgi_sqlite3: kommandot finns inte
uwsgi_sqlite3: komut yok
uwsgi_sqlite3: nie znaleziono polecenia
uwsgi_sqlite3: níor aimsíodh an t-ordú
uwsgi_sqlite3: no se encontró la orden
uwsgi_sqlite3: no s'ha trobat l'ordre
uwsgi_sqlite3: opdracht niet gevonden
uwsgi_sqlite3: parancs nem található
uwsgi_sqlite3: perintah tidak ditemukan
uwsgi_sqlite3: príkaz nenájdený
uwsgi_sqlite3: příkaz nenalezen
uwsgi_sqlite3: команда не найдена
uwsgi_sqlite3: командата не е открита
uwsgi_sqlite3: 命令找不到
uwsgi_sqlite3: コマンドが見つかりません