The message appears if you create a schedule report but then the .rep
file located in the C:\Program Files\Datatex\tng\scheduled folder
is deleted after the TNG service was started.
In other words,
TNG starts up and .rep file exists in the scheduled folder so it loads it into memory.
When the .rep file is deleted and TNG thinks it still exists, then when it wants to
run the scheduled report, it sees that it is not there anymore, TNG will populate this message.
If you are using the scheduled reports feature and this error occurs, please check if the .rep files
is in the Scheduled folder. If not, please recreate the schedule reports in TNG.
Also See: TNG and scheduled reports/archiving reports
This will ensure that the .rep file is created and that the report will run as scheduled.