为提高效率，提问时请提供以下信息，问题描述清晰可优先响应。
- 【TiDB 版本】：v3.0.3
- 【问题描述】：
[2020/09/02 13:06:19.207 +08:00] [ERROR] [main.go:59] [“tidb lightning encountered error”] [error=“config file contained unknown configuration options: tikv-importer.on-duplicate”] [errorVerbose=“config file contained unknown configuration options: tikv-importer.on-duplicate\ngithub.com/pingcap/tidb-lightning/lightning/config.(*Config).LoadFromTOML\ \t/home/jenkins/workspace/release_tidb_3.0/go/src/github.com/pingcap/tidb-lightning/lightning/config/config.go:271\ngithub.com/pingcap/tidb-lightning/lightning/config.(*Config).LoadFromGlobal\ \t/home/jenkins/workspace/release_tidb_3.0/go/src/github.com/pingcap/tidb-lightning/lightning/config/config.go:207\ngithub.com/pingcap/tidb-lightning/lightning.(*Lightning).RunOnce\ \t/home/jenkins/workspace/release_tidb_3.0/go/src/github.com/pingcap/tidb-lightning/lightning/lightning.go:128\ main.main\ \t/home/jenkins/workspace/release_tidb_3.0/go/src/github.com/pingcap/tidb-lightning/cmd/tidb-lightning/main.go:56\ runtime.main\ \t/usr/local/go/src/runtime/proc.go:200\ runtime.goexit\ \t/usr/local/go/src/runtime/asm_amd64.s:1337”]
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