OpenVPN Error EASYRSA_PKI does not exist

Erreur #0:
OMV\ExecException: Failed to execute command 'export PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin; export LANG=C.UTF-8; /usr/sbin/omv-openvpn add '1a90ac33-426b-46f0-a50f-778541d3398b' 2>&1' with exit code '2':
Easy-RSA error:
EASYRSA_PKI does not exist (perhaps you need to run init-pki)?
Expected to find the EASYRSA_PKI at: /etc/openvpn/pki
Run easyrsa without commands for usage and command help.
/opt/EasyRSA-v3.0.6/easyrsa: 319: set: Illegal option -o echo in /usr/share/php/openmediavault/system/process.inc:182
Stack trace:
#0 /usr/share/openmediavault/engined/rpc/openvpn.inc(209): OMV\System\Process->execute()
#1 [internal function]: OMV\Engined\Rpc\OpenVpn->set(Array, Array)
#2 /usr/share/php/openmediavault/rpc/serviceabstract.inc(123): call_user_func_array(Array, Array)
#3 /usr/share/php/openmediavault/rpc/rpc.inc(86): OMV\Rpc\ServiceAbstract->callMethod('set', Array, Array)
#4 /usr/sbin/omv-engined(537): OMV\Rpc\Rpc::call('OpenVpn', 'set', Array, Array, 1)
#5 {main}