Corrupted .fit workouts

I’ve planned a workout in Activities. When I exported it as a .fit file and tried to import in my Sigma, it said that the file is corrupted. The same happened when I tried to import it into TrainingPeaks.

Can you give a little more infos what the workout look like

Here are my workout descriptions and some screen shots:

Warmup  30m Z1-Z2 HR intensity=warmup

PANO 3x
- PANO 10m Z4-Z4 HR intensity=interval
- Recovery 5m Z2-Z2 HR intensity=recovery

- Coll Down 45m Z1-Z2 HR

Maybe related to this?