停止服务，然后重新启动它们.那为我解决了.另外，不要忘记设置环境变量WA_API_VERSION=2.29.1.

Stop the services and then restart them. That solved for me. Also, do not forget to set the environment variable WA_API_VERSION=2.29.1.

请注意: 版本号是您使用的当前版本号.根据 Facebook，您需要在 2020 年 8 月 29 日之前升级到版本 2.29.1.请参阅 安装指南了解详情.

Please note: The version number is the current version number you are using. As per Facebook you need to upgrade to version 2.29.1 before August 29, 2020. Refer to the installation guide for details.