The planner is trying to spawn "traffic_prius" but you uninstalled it. Check the console log (red text). Go to the planner settings and change Car Pool to "Kunos Only."
If the planner freezes or spawns cars that just sit still, you have a CSP version conflict. Roll back to CSP 0.1.80 or update to the latest preview build. 90% of traffic mod bugs are CSP related. Part 8: Performance Optimization Running 40 AI cars with dynamic pathfinding is heavy on the CPU. Assetto Corsa is old; it hates many objects. assetto corsa traffic planner mod
In Content Manager ( Settings > Assetto Corsa > System ), make sure "Enable Python apps" is checked. Also, disable "Use single-threaded AI" in CSP. The planner is trying to spawn "traffic_prius" but
The is the missing link between simulation and lifestyle driving. Without it, Assetto Corsa is a racing simulator. With it , Assetto Corsa becomes a driving simulator. Roll back to CSP 0