Hi!
It's your first track, everybody knows it's not easy, and you made it!
I just share here this point in case it helps:
The crash "Track not found" can be easily solved by renaming the "ac circuit.kn5" in "manola.kn5" as it is named in the ui_track.json in ui folder.
Then, it works fine, though it can only be launched in hotlap mod, as there is no ai file.
In replay, it's only f1 view allowed; trying to set f6 views could lead to crash, because there is no camera.ini file at the moment.
Otherwhise, it's clean, and the laptimes are working fine.
At last, points like, road textures, bumpiness, elevation (nothing is that flat on earth, even very flat tracks!) will be needed to improve the sense of immersion.
its a really tiny track, a bigger layout could be expected.
Hoping you plan to continue with this one, or with another project!