I got warning before because the script waited for a long time for the end of a stored procedure on Oracle database.
I checked other threads and people usually are not able to identify the problem and get all the data. In my case it was the same. So, I think it says there is something wrong but this will not result in any data loss (I hope)
Specifically in your case it seems that the server was not able to read (maybe also write) the log file. Do you always get this warning? If so, try to check if there is process locking log files.