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.
These are the threads I mentioned:
I checked again the document and task logs, and did not find any helpful information. The most time-consuming part is a load from a website, which takes only 10 secs, and the data is loaded ok.
I tried to recreate the task, as mentioned in one of the threads, but the warning still appears.
I also hope that it won't result in data loss...