That is because you do not have the rolling stock this scenario uses. You can try to play it by pressing F2, then Cancel (if it is not part the player's consist it may work)
hello well thank you for that information but I tryed to dowload it from railstudio and nothing cahnged and btw i have a mod for railstudio
and by the way I installit and they came as zip files and the tool for modding said it could not do it
Buna ziua, you are not providing enough details for us to help. Contacting RailStudios.com would be a better idea. La revedere!
It might be a problem with the Scenario You would be better asking on this FB page https://www.facebook.com/groups/trainsimromania