Help with datapack, predicates not running.

So i am trying to make a mod where i have a emerald with a NBT tag of {display:{Name:'{"text":"Fire Gem","color":"dark_red","bold":true}',Lore:['{"text":"FlameWasTaken66","color":"light_purple"}']},CustomModelData:101,FireGem:1} And in a predicate folder i am trying to check if the player has a item with nbt FireGem:1 in his offhand. predicate { "condition": "minecraft:entity_properties", "entity": "this", "predicate": { "equipment": { "mainhand": { "nbt": "{FireGem:1}" } } } } And in a mcfunction (just for testing, in load.mcfunction file) i am running this code say Hi execute if predicate custom:fire run say Predicate works In load.mcfunction second line the code is expected to say predicate works in my game chat when i hold the emerald gem in my offhand and reload the game but it is not happing i tried doing it with advancement way and it still didn't work and then i tried restarting my datapack (uninstall and install the datapack) but still didn't work. I am using Visual Studio Code to edit my mcfunction and i am beginner to datapack creation. Please Help me!