Review the following:
- Verify that the App_Data folder and all subfolders and files have read/write permissions
. (for more information see Progress Article 000075595, Error logs are not getting created
- Check if a third-party tool
for Error logging is enabled (e.g. Elmah).
- Verify that the error logs are not disabled
(e.g. as specified in Sitefinity Forums, Disable error log https://www.sitefinity.com/developer-network/forums/developing-with-sitefinity-/disable-error-log
- Enable debugging and delete all the current logs in App_Data/Sitefinity/Logs