I deleted an entity and it appears to be causing lag

I had an entity, deleted it because it prevented my world from loading, and looking into the console, it keeps trying to spawn it again and I suspect it causes lag. Here is the console (I don't know if it's called the 'console', correct me if I'm wrong):

 Failed to decode value '"babys_first_war_crime:ride"' from field 'id': Unknown registry key in ResourceKey[minecraft:root / minecraft:entity_type]: babys_first_war_crime:ride
[15:22:51] [Render thread/WARN] [minecraft/EntityType]: Skipping Entity with id babys_first_war_crime:ride
[15:22:51] [Render thread/WARN] [minecraft/EntityType]: [net.minecraft.world.entity.EntityType] Serialization errors:
: Failed to decode value '"babys_first_war_crime:ride"' from field 'id': Unknown registry key in ResourceKey[minecraft:root / minecraft:entity_type]: babys_first_war_crime:ride
[15:22:51] [Render thread/WARN] [minecraft/EntityType]: Skipping Entity with id babys_first_war_crime:ride
[15:22:51] [Render thread/WARN] [minecraft/EntityType]: [net.minecraft.world.entity.EntityType] Serialization errors:
: Failed to decode value '"babys_first_war_crime:ride"' from field 'id': Unknown registry key in ResourceKey[minecraft:root / minecraft:entity_type]: babys_first_war_crime:ride
[15:22:51] [Render thread/WARN] [minecraft/EntityType]: Skipping Entity with id babys_first_war_crime:ride

And it just keeps going like that. Also, the entity is "ride," because I was trying to make a ridable mount.