Error during 1-simple lap

[Ripa00]

Hi Juan, i'm trying to run the 1 simple lap, but at the end when i write the last row run = fastest_lap.download_variables(*fastest_lap.optimal_laptime(vehicle_name, track_name, s, options))

this error shows up

[C++ exception] -> std::bad_cast terminate called after throwing an instance of 'std::exception' what(): std::exception Aborted

how can i fix it?? Thank you and congratulations for this software