Loottables not working

I'm making a mod to structures and im trying to make custom loottables for them. I've followed many tutorials but the command to give a chest the loottables loot isnt working. The command im using is: /data merge block ~ ~-2 ~ {LootTable:'small_ruins_loot'} the command block is 2 blocks above the chest. When i activate the command block it says that the command worked but theres nothing in the chest. In case i did the loottable wrong here is a screenshot of it: