I assume you have or have had another Monza 10 installed?
If that is the case go to the Userdata\Log\Hat folder and delete the 10_Monza.hat file. If that is not the case re-download and install again as you must have some corruption in the .trk file.
If that is the case go to the Userdata\Log\Hat folder and delete the 10_Monza.hat file. If that is not the case re-download and install again as you must have some corruption in the .trk file.