unknown error

[iks13]

I have GeForce GTX 750Ti.
Config:
{
"algo": "cryptonight",
"background": false,
"colors": true,
"donate-level": 1,
"log-file": null,
"print-time": 60,
"retries": 999,
"retry-pause": 5,
"threads": [
{
"index": 0,
"threads": 32,
"blocks": 20,
"bfactor": 8,
"bsleep": 100,
"affine_to_cpu": false
}
],
"pools": [
{
"url": "server:3333",
"user": "wallet",
"pass": "x",
"keepalive": true,
"nicehash": false,
"variant": -1
}
],
"api": {
"port": 0,
"access-token": null,
"worker-id": null
}
}

After start:

VERSIONS: XMRig/2.6.1 libuv/1.19.2 CUDA/9.10 MSVC/2015
CPU: Intel(R) Core(TM) i5-2500 CPU @ 3.30GHz x64 AES-NI
GPU #0: GeForce GTX 750 Ti @ 1084/2700 MHz 32x20 8x100 arch:50 SMX:5
ALGO: cryptonight, donate=5%
POOL #1: server:3333
COMMANDS: hashrate, health, pause, resume
[2018-05-22 15:59:42] use pool server:3333 192.168.0.30
[2018-05-22 15:59:42] new job from server:3333 diff 181659
[CUDA] Error gpu 0: <cryptonight_extra_cpu_final>:373 "unknown error"