Maybe a screenshot of the cars list could help to find the car/class you have the problem with.
Do you have any other mod´s, from other communities? Maybe there is a conflict with the car id. (Each car has an ID, there are only 255 Id´s possible in race. If two cars (from mods) have the same, you will get a problem)
Ok, the missing car class is "Formula Masters". I tried to find them in Race07->Downloads-> Mods , but could not find them there. Maybe an admin has an idea, where you can download it.
Hallo
RR is the only game now still workin everyting whit autoupdater is not workin enymore RF2 GTR2 Race 07 have to reinstal everything. i dont know where to find all those crache reports .