syncevo-http-server: 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/syncevo-http-server - from package: syncevolution-http

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

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