Yellow and black stripey ground texture means it's a "missing texture". As you said yourself a misplaced or removed file.
If the game cannot find the texture it's looking for, it will replace it with this yellow and black texture for whatever it's missing one for. You really should be careful and remember where you move things and not click around too much.
If you are unable to find where you moved these files to, or if they are in your recycle bin for you to restore the items removed, since you already know it's the ground texture, I'd suggest following:
Install another copy of feralheart on your desktop or in a custom path like C:\Backupferalheart\FeralHeart temporarily. Find your way into the game folder of the new backup feralheart you installed and go into media\terrains\textures until you see all the ground textures.
Once you're there copy ALL the content inside of the folder. Go back to your original FeralHeart game(most likely installed in C:\FeralHeart, go into it's media\terrains\textures and then PASTE the textures you got from the new game. It will put in any missing textures that way.
This way if you have any custom mods or textures anyplace else you don't need to redownload them in a new game, just fix your first issue, however if these instructions are too hard to follow.
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Just re-install your game, remove the game from C:\FeralHeart, then install a new game again.
Snagged this from another thread about black and yellow texture - I'd suggest glancing through this and use bits and pieces you see fit from this for your problem. ;w;
also a few more quotes others suggested on this kind of topic.
Since you know how to download it, I'm going to be a bit less specific.
1. Unzip the file.
2. Put all files inside into my_objects unless it is a png image. Place the png images into feralheart>media>textures (some computers don't need to separate them, others do.)
3. Restart FH.
4. Open Object maker.
5. Go into Mesh tab.
6. Put what the file name was (you may need to look at the original folder to see what the person named it!) and add .mesh after it.
Usually the black and yellow texture means you are missing a file or a file has been corrupted.
Are you sure you have all the needed textures in your Media>Terrain folder?