SharePoint users get an internal server error while performing a search.
This error appears for Out Of The Box search site too.
If the stack trace is enabled, the message will contain information "Illegal operation attempted on a registry key that has been marked for deletion".
Perform these steps on all SharePoint servers to fix this issue -- Restart Search Query and Site Settings Service from Central Administration
- Restart the application pool for SecurityTokenService
- Reset IIS
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