Plugins owned FrontPlugins and QualityPlugins are fake, remove those.
You can find the real F3X plugin here:
Building Tools by F3X
And the real Part To Terrain here:
Github link for Part to Terrain can be found here
GitHub - mkargus/PartToTerrain: Roblox plugin that allows parts to turn into terrain.
Remember to check who uploaded the plugin, if they’re uploaded by an account that looks new, don’t trust it.