EN
Hello and welcome to the community. 
According to Google Translate, you are writing in Chinese. If you are using WeMod from Chinese territory, you will also need to use a VPN, unfortunately. This is because the Chinese government has chosen to enforce censorship on western gaming products and services.
Otherwise, this thread also has some troubleshooting for you: I can’t Install WeMod / "There was a error installing the application" - #2 by Ravenfyre.
CN
您好，欢迎加入社区。
根据谷歌翻译，您在用中文写作。如果您在中国境内使用WeMod，不幸的是，您还需要使用VPN。这是因为中国政府选择对西方的游戏产品和服务进行审查。
此外，这个帖子也有一些故障排除的建议供您参考：I can’t Install WeMod / "There was a error installing the application" - #2 by Ravenfyre