系统接口500异常怎么搞？

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Proxy error: Could not proxy request /captchaImage from localhost:8089 to http://localhost:9090/.
See https://nodejs.org/api/errors.html#errors_common_system_errors for more information (ECONNREFUSED).

显示是这样，我进入这个系统它就提示系统接口500异常，不知道怎么解决。求解！