Failed to start threads.
I have some ATI Radeon HD 4300/4500 Serie
When I try to run xmrig-amd, xmrig shows me:
`found AMD platform index: 0, name: Advanced Micro Devices, Inc.`
`found OpenCL GPU: ATI Radeon HD 4300/4500 Series (ATI RV710), cu: 2`
`Failed to start threads.`
how can I fix this?

edit:

My config.json
`{`
`    "algo": "cryptonight",`
`    "api": {`
`        "port": 0,`
`        "access-token": null,`
`        "worker-id": null,`
`        "ipv6": false,`
`        "restricted": true`
`    },`
`    "background": false,`
`    "colors": true,`
`    "donate-level"`: 1,
`    "log-file": null,`
`    "opencl-platform": "AMD",`
`    "pools": [`
`        {`
`            "url": "xx",`
`            "user": "xx",`
`            "pass": "x",`
`            "keepalive": true,`
`            "nicehash": false,`
`            "variant": -1,`
`            "tls": false,`
`            "tls-fingerprint": null`
`        }`
`    ],`
`    "print-time": 60,`
`    "retries": 5,`
`    "retry-pause": 5,`
`    "syslog": false,`
`    "threads": null`
`}`

made by [xmrig-config](https://config.xmrig.com)