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EFilerError is a rare issue at the startup of coDiagnostiX.\\
It usually occurs with versions older than 8.5.0 and can be solved in a few minutes by deleting temporary configuration files for the Online Update.
- Navigate to the coDiagnostiX configuration folder ([[tech:config_folder|How to]])
- Close coDiagnostiX if running
- Check if the Online Updater is running and end the process using Task Manager (''OnlineUpdater.exe'')
- **__Create a backup of__** and delete all ''XML'' files in the configuration folder which names begin with ''OnlineUpdateData_'' or ''VersionInfo_''.\\ Examples are shown below: \\ {{:errors:errors_efilererror_xmlfiles.png|}}
- Transfer the Backup of the files to Dental Wings for further diagnosis ([[coDiagnostiX.support@dental-wings.com]])
- Start coDiagnostiX and check again
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**Please note:**\\
Be careful not to delete any folders or ''INI'' files in the process.