connect error: buffer_full : allocated=1 size=0 offset=512 capacity=3088 newcap=7696

I could connect openvpn by test cli.cpp in Project ovpncli. But every time I connect successfully, it will be disconnect in 10 seconds. I notice the error message "buffer_full" and I don'y know if I should change some setting.
Before I debug the cli.cpp I firstly install wintun driver and successfully install a new wintun driver tunnel. I also could connect ovpn by "dev tun" in my profile. Is there any methods to stay the connection? Thank you in advance.

Here is the log from command line:

Successfully flushed the DNS Resolver Cache.
Wed Jan 27 17:10:03 2021 Connected via wintun
Wed Jan 27 17:10:03 2021 EVENT: CONNECTED 219.100.37.92:443 (219.100.37.92) via /TCPv4 on wintun/10.238.205.205/ gw=[10.238.205.206/]
Wed Jan 27 17:10:13 2021 netsh interface ip delete address 54 10.238.205.205 gateway=all store=active

netsh interface ip delete route 219.100.37.92/32 15 10.64.25.1 store=active
Ok.

netsh interface ip delete route 0.0.0.0/1 54 10.238.205.206 store=active
Ok.

netsh interface ip delete route 128.0.0.0/1 54 10.238.205.206 store=active
Ok.

netsh interface ip delete dnsservers 54 all validate=no

NRPT::ActionDelete
ActionWFP openvpn_app_path=E:\OpenVPN3\build\test\ovpncli\Debug\ovpncli.exe tap_index=54 enable=0
WFPEngine closed
ipconfig /flushdns

Windows IP Configuration

Successfully flushed the DNS Resolver Cache.
Wed Jan 27 17:10:13 2021 EVENT: DISCONNECTED
connect error: buffer_full : allocated=1 size=0 offset=512 capacity=3088 newcap=7696
Thread finished
STATS:
BYTES_IN : 42886
BYTES_OUT : 44901
PACKETS_IN : 94
PACKETS_OUT : 311

Start with the test cli.cpp in Project ovpncli and reproduce the connection using the reported wintun setup. Trace the disconnect occurring about 10 seconds after EVENT: CONNECTED and inspect the reported buffer_full error alongside the command-line log. Done means identifying why the connection closes and keeping it active without the buffer error.