我尝试以编程方式启动appium服务器，但遇到错误。如何解决这个问题？我已经安装了nodejs，安装了appium，并正确设置了环境变量。我使用的是maven appium java client 6.1.0和selenium 3.14.0。请帮助。十亿感谢您的帮助。
验证码：

try {
            File appDir = new File(System.getProperty("user.dir"));
            File app = new File(appDir, "..\\apk\\Flipkart.apk");

            // apk Capabilities
            DesiredCapabilities caps = new DesiredCapabilities();
            caps.setCapability("deviceName", "Sony Xperia Z2");
            caps.setCapability("BROWSER_NAME", "Android");
            caps.setCapability("platformVersion", "6.0");
            caps.setCapability(MobileCapabilityType.PLATFORM_NAME, Platform.ANDROID);
            //caps.setCapability("udid", "WUJ01N4RQ3"); // DeviceId from "adb devices" command
            caps.setCapability("platformName", "Android");
            caps.setCapability("app", app.getAbsolutePath());
            caps.setCapability("appPackage", "com.flipkart.android");
            caps.setCapability("appActivity","com.flipkart.android.SplashActivity");

            // Appium Capabilities
            caps.setCapability("skipUnlock","true");
            caps.setCapability("noReset","false");

            appiumBuilder = new AppiumServiceBuilder();
            appiumBuilder.withIPAddress("127.0.0.1");
            appiumBuilder.usingPort(47233);
            appiumBuilder.withCapabilities(caps);
            appiumBuilder.withStartUpTimeOut(3, TimeUnit.MINUTES);
            appiumBuilder.withLogFile(new File(System.getProperty("user.dir") + "\\log\\appium.log"));
            appiumBuilder.withArgument(GeneralServerFlag.SESSION_OVERRIDE);
            appiumBuilder.withArgument(GeneralServerFlag.LOG_LEVEL, "DEBUG");
            appiumBuilder.withArgument(GeneralServerFlag.ASYNC_TRACE, "true");

            appiumServer = AppiumDriverLocalService.buildService(appiumBuilder);
            appiumServer.start();
            //new URL("http://127.0.0.1:47233/wd/hub")
            driver = new AndroidDriver<MobileElement>(appiumServer, caps);
            driver.manage().timeouts().implicitlyWait(5, TimeUnit.SECONDS);

        } catch (Exception ex) {
            LogManager.logger.log(Level.INFO, "Exception: " + ex.getMessage());
        }

错误日志：
信息：异常：发生了无效的服务器示例异常：没有安装节点！请通过NPM（https：//www.npmjs.com/package/appium#using-node-js）安装节点或下载并安装Appium应用程序（http://appium.io/downloads.html）2019年1月03日下午3：52：12 com.peterwkc.testManager.AndroidManager tearDown信息：异常：null
编辑：我相信appium源代码无法检测到我安装的nodejs和appium。