Meshes not appearing, I don't understand the errors?

So, I was working on a racetrack for my game, and I suddenly started getting a bunch of errors. My meshes weren't appearing, and the only thing that appeared was a piece of grass.

Restarted roblox studio, only a few meshes appeared and one was missing textures but still had the texture ID and also one mesh had the grass texture I was talking about earlier. There are fewer errors now.

Here is the output in the console:

16:50:46.231 - Image "https://assetdelivery.roblox.com/v1/asset?id=4247467206" failed to load in "Workspace.MeshPart.TextureID": Request failed
16:50:48.837 - Image "rbxthumb://type=Asset&id=4222065119&w=150&h=150" failed to load in "TextureManager::PreloadTexture": Request failed
16:50:48.867 - ContentProvider:PreloadAsync() failed for rbxthumb://type=Asset&id=4222065119&w=150&h=150