Unity game: 3D runner(generating random prefabs.plshelp)

[nobody12]

So i have been working on a 3d runner game from a week. since 2 days i have been trying to add random coins in the game but it shows error everymethod i try. I have now created prefabs for every coin/obstacles i want with a ground on which the player is running, I just can't figure out how to randomly create prefab one by one.
picture of game : https://imgur.com/gallery/4VOS1

[jilla123]

The picture of the game is bugged or you've not provided the correct link,maybe.

[Playa]

The picture of the game is bugged or you've not provided the correct link,maybe.

[nobody12]

https://imgur.com/gallery/4VOS1
Edited the main post too

[nobody12]

I figured out a way for it 2 days back. Forgot to inform.
/Lock

[Astrl]

I figured out a way for it 2 days back. Forgot to inform.
/Lock

Locked.