Update asset paths
Please use:
TRAIN_PATH = "/flash/sys/apps/octycs-train-sim/assets/train.png"
TREE_PATH = "/flash/sys/apps/octycs-train-sim/assets/tree.png"
SAMPLE_STOERUNG = "/sys/apps/octycs-train-sim/assets/stoerung.wav"
SAMPLE_SIFA = "/sys/apps/octycs-train-sim/assets/sifa.wav"
SAMPLE_SIFA_ZB = "/sys/apps/octycs-train-sim/assets/sifa-zb.wav"
to make it work with the app directory