For every item your mods add.
You have to put the manifest.json in a folder named my_margin_removal_mod. When mod name in the manifest is different from the folder name the game refuses to load a mod.
I see you like having fun with mods, I think you should learn some modding basics so you can at least fix some compatibility issues yourself when you play with many mods at once. You don’t have to learn the advanced stuff, coding the manifest and adding entities should be enough for you. It also makes interpreting the error logs easier. It took me one evening to learn the basics, Stonehearth is really modder-friendly.