Why I get error messages when a passenger enter into the vehicle?

Sl do not allow more than 31 prims in a vehicle, each passenger has 1 prim.
The Apolon@Motor vehicles are generally 30 prims + 1 for the pilot.

This error message can be ignored as does not affect the functionality.

The most important thing is that pilot must enter first into the vehicle and then the passengers,
ignoring the error messages for passenger!