problem about StreamMapNet -Hivt trajectory prediction

[JT-Sun]

Hello, I have successfully trained and tested StreamMapNet, but when I [Merge Map and Trajectory Dataset], the code shows that the predicted_map has been successfully generated,

but during the trajectory prediction phase, it still shows that the predicted_map is missing.

The information shows that the error only occurred after processing 4 scenes. Do you have any suggestions for this?