Adwords接口ReportDefinitionService:找不到ReportDefinition

import com.google.api.ads.adwords.lib.AdWordsSession;
import com.google.api.ads.adwords.v201809.cm.ReportDefinition;
import com.google.api.ads.adwords.v201809.cm.ReportDefinitionServiceInterface;
import com.google.api.ads.adwords.v201809.cm.ReportType;
import com.google.api.client.googleapis.auth.oauth2.GoogleCredential;
import com.google.api.client.http.javanet.NetHttpTransport;
import com.google.api.client.json.jackson2.JacksonFactory;

public class ReportDefinitionExample {
    public static void main(String[] args) throws Exception {
        // 初始化AdWords会话
        AdWordsSession session = new AdWordsSession.Builder()
            .fromFile() // 从配置文件加载凭据
            .build();

        // 获取ReportDefinitionService
        ReportDefinitionServiceInterface reportDefinitionService =
            session.getEffectiveAccount().getService(ReportDefinitionServiceInterface.class);

        // 创建报告定义
        ReportDefinition reportDefinition = new ReportDefinition();
        reportDefinition.setReportType(ReportType.ACCOUNT_PERFORMANCE_REPORT);
        reportDefinition.setDateRangeType("LAST_7_DAYS");
        reportDefinition.setDownloadFormat("CSV");

        // 创建报告定义操作
        ReportDefinitionOperation operation = new ReportDefinitionOperation();
        operation.setOperand(reportDefinition);
        operation.setOperator(Operator.ADD);

        // 执行操作并获取响应
        ReportDefinitionReturnValue result = reportDefinitionService.mutate(new ReportDefinitionOperation[] {operation});

        // 输出报告定义ID
        System.out.printf("Report definition with ID %d was created.%n", result.getValue()[0].getId());
    }
}