Sorry, you said that in your op. Still learning how to read…
Open your job traveler report in report builder or whatever you use. Change the path on the sub-report so it is only the sub report name and not the whole file path.
As long as the sub-report is in the same folder as the main report the path is inherent. I was able to duplicate your issue by using the entire filepath instead of just the sub-report name.
Not this
This
