problems with openvpn

hello my name is Fabio and i brazilian,
i used yealink T20 Phone with a V73 firmware.
i set the vpn.cnf with the path of my server openvpn but don't works.

Apr 4 00:00:18 openvpn[411]: OpenVPN 2.1.3 mipsel-unknown-linux-uclibc [SSL] [LZO2] [EPOLL] built on Feb 2 2015
Apr 4 00:00:18 openvpn[411]: NOTE: OpenVPN 2.1 requires '--script-security 2' or higher to call user-defined scripts or executables
Apr 4 00:00:18 openvpn[411]: Cannot load certificate file /yealink/config/openvpn/keys/client.crt: error:02001002:system library:fopen:No such file or directory: error:20074002:BIO routines:FILE_CTRL:system lib: error:140AD002:SSL routines:SSL_CTX_use

i attached logs of my phone

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