Hello anonymous user ,
Welcome to Q&A Forum!
If the error is occurring for random/specific users and not everyone in your organization, please perform the following troubleshooting:
- Please make sure users granted library/list-specific permissions also have read access to the hosting site.
- Check server event logs and ULS logs to see more detailed error messages
- Test other site collections or web applications
- Clear browser cache
For more information, please refer to this post.
Thanks,
Echo Du
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