自托管服务器，更新最新版后无法登录了，网页能正常访问密码库，安卓也可以正常登录，就iOS不行，软件删除了重新下载也不行。提示An error has occurred.
@qq87066768 Hi!
Just a suggestion in your own interest: I guess, posting in English will dramatically increase the chance to get help. 
首先是我更新最新版以后遇到的问题，反馈问题而已。其次，我本来就是中国人，用中文本来就是很正常的事情，你看不懂不代表其他人也看不懂！
@qq87066768 Welcome to the forum!
Please post a screenshot the Dashboard of your Admin Portal, which displays your server version.
Also, please let us know what operating system is used for both your server and your client apps, as well as the version of the mobile app that you are using (e.g., are you using the general release or the beta release, and what version number?).
Finally, you seem to be stating that purpose of your post is for feedback only, implying that you are not seeking any assistance with this issue. If this is not the correct translation of your second post, then please clarify. In case you were attempting to file a bug report, those should be submitted on GitHub, and generally require more detailed information than what you’ve provided here.
I see from your first screenshot that you are self-hosting using Vaultwarden, not Bitwarden Server.
Vaultwarden is not a Bitwarden product, so there are naturally going to be compatibility issues between the Vaultwarden server and the official Bitwarden client apps from time to time.
If you still need help with your iOS login issue, your best bet is to turn to the Vaultwarden community for support: