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if err != nil || len(chainInfo.NodeList) == 0 {
    log.Info("[SDK] Get Chain Info Failed : " + err.Error())
    err = DealChainConfigError(sdkClient, chainId)
    if err != nil {
        return
    }
}

err.Error()在还没有订阅链信息时，err为nil，此时err.Error()报空指针错误