DingDing Error: missing mainframe dll [How to Solve]

Repair steps:
1. Press “windows logo key + X”, Start Windows PowerShell (administrator) Enter the command “auto repair system
2. Dism/online/cleanup image/scanhealth” to scan all system files and compare them with the official system files to scan for inconsistencies in the computer
3. The command dism/online/cleanup image/checkhealth must be used when the system file is found to be damaged after the previous command is executed
4. Dism/online/cleanup image/restorehealth this command restores those different system files into official system source files
5. Restart after completion. No matter whether the above is successful or not, type the following command: SFC/scannow

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