That "someone" is me...
To help you I need to see the log_metro.txt file and know what do you have in the "addons" folder.
Do you have mods located in a "metro" folder?
Here is my log_metro
Opened log in "userdata/log_metro.txt".
Version: 1.0.22
initializing FMOD...
[done]
initializing OpenGL-window...
[done]
Loaded language "en_US"
Engine initialization finished
Loading ui...
[done]
Loading addon "addons/germany"...
[done]
Loading addon "addons/mappack01"...
[done]
Loading addon "addons/munich"...
[done]
Loading addon "addons/tokyo"...
[done]
Loading addon "addons/usa"...
[done]
Loading addon "addons/vehiclepack01"...
[done]
Loading addon "addons/vehiclepack02"...
[done]
Loading addon "addons/vehiclepack03"...
[done]
Loading addon "addons/vehiclepack04"...
[done]
Loading addon "addons/z_vehicleRealismModV3_2"...
[done]
Loading achievements...
[done]
Loading main menu...
[done]
Steam initialized
Start scenario "metro/scenarios/sandbox.scenario"
Loading game...
Error: File "addons/vehiclepack03/bus01/bus19.object" not found!
Error: Runtime error in "metro/scripts/environment.script" at line 136: Internal error!
Error: Called from "addons/vehiclepack03/scripts/environment.script" at line 3
Error: Runtime error in "metro/scripts/environment.script" at line 212: Internal error!
Closed log in "userdata/log_metro.txt".