crypt-gpg-pinentry: 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/bin/crypt-gpg-pinentry - from package: php-pear-crypt-gpg

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

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