Please do not rely on the app. It does not get enough updates to be reliable.
It's better to use the Deutsche Bahn planner or the DB Navigator app for international planning or the operators’ own websites and apps for domestic travel.
Further, there are engineering works in the south of France between 10 and 14 November. The TGVs between France and Barcelona don't run on these days.
It may be possible to find connections via:
- Hendaye/Irún. Search to Hendaye and from Irún; there's a frequent local train (Euskotren) between the 2 places.
- Latour-de-Carol (nice route but takes a lot longer)
- Perpignan, Port-Bou and then a regional train to Barcelona (although it seems to be impossible or at least very difficult to book an Interrail/Eurail reservation for the night train to Latour-de-Carol)
Unfortunately, Spanish railways do not send all of their timetables to the European Timetable Centre, so the Interrail app is incomplete for Spain (Port-Bou - Barcelona + Latour-de-Carol - Barcelona are missing).
Portbou - Barcelona can be looked up in this RENFE planner.
Latour-de-Carol - Barcelona can be looked up in this RENFE planner.