我在 Windows 10 上将 Miktex 与 Texstudio 结合使用。突然，在没有任何更改或设置更改的情况下，MiKTeX 在请求新包时开始抛出错误。Texstudio 只是说：
Process started: xelatex.exe -synctex=1 -interaction=nonstopmode "ThesisReport".tex
Unfortunately, the package breqn could not be installed. Please check the log file: C:\Users\Karl\AppData\Local\MiKTeX\2.9\miktex\log\xelatex.log
启动 MiKTeX 控制台时，我收到来自 Windows 的警告通知。当我尝试在 MiKTeX 控制台中选择“保持用户模式”选项时，我收到以下错误消息：
GENERAL MIKTEX INFORMATION
Date: 2020-02-12 22:11:22
MiKTeX: 2.9.7250
OS: Windows 10 Education, 64-bit, build 18363
SharedSetup: yes
LinkTargetDirectory: C:\Program Files\MiKTeX 2.9\miktex\bin\x64
PathOkay: yes
LastUpdateCheckAdmin: 2020-01-31 15:55:58
LastUpdateAdmin: 2020-01-31 14:51:12
SystemAdmin: yes
RootPrivileges: no
AdminMode: no
Root0: C:\Users\Karl\AppData\Roaming\MiKTeX\2.9
Root1: C:\Users\Karl\AppData\Local\MiKTeX\2.9
Root2: C:\ProgramData\MiKTeX\2.9
Root3: C:\Program Files\MiKTeX 2.9
UserInstall: C:\Users\Karl\AppData\Roaming\MiKTeX\2.9
UserConfig: C:\Users\Karl\AppData\Roaming\MiKTeX\2.9
UserData: C:\Users\Karl\AppData\Local\MiKTeX\2.9
CommonInstall: C:\Program Files\MiKTeX 2.9
CommonConfig: C:\ProgramData\MiKTeX\2.9
CommonData: C:\ProgramData\MiKTeX\2.9
Invokers: non-existing/explorer
ERROR DETAILS
Program: C:\Program Files\MiKTeX 2.9\miktex\bin\x64\miktex-console.exe
Source: Libraries\MiKTeX\Core\Cfg\Cfg.cpp:1052
Error: A MiKTeX configuration file could not be loaded.
Details:
file: C:\Program Files\MiKTeX 2.9\miktex/config\package-manifests.ini
line: 89804
error: invalid value definition
第 89804 行包含：nual4.html
以下是周围的线条：
我不知道发生了什么。也许有人可以告诉我错误出在哪里？