No key name in MapLike:

As the title suggests, when I add the custom tree code below, and I enter my world, I get this error in my launcher: 
[Render thread/ERROR]: Feature: No key name in MapLike[{"config":{"feature":{"config":{"max_water_depth":0,"ignore_vines":true,"heightmap":"OCEAN_FLOOR","minimum_size":

{"limit":1,"lower_size":0,"upper_size":1,"type":"minecraft:two_layers_feature_size"}

,"decorators":[],"trunk_provider":{"state":{"Properties":

{"axis":"y"}

,"Name":"minecraft:bone_block"},"type":"minecraft:simple_state_provider"},"leaves_provider":{"state":{"Properties":{},"Name":"minecraft:white_wool"},"type":"minecraft:simple_state_provider"},"foliage_placer":{"radius":2,"offset":0,"height":3,"type":"minecraft:blob_foliage_placer"},"trunk_placer":{"base_height":5,"height_rand_a":2,"height_rand_b":0,"type":"minecraft:straight_trunk_placer"}},"name":"minecraft:tree"},"decorator":{"config":{"outer":{"config":{},"type":"minecraft:square"},"inner":{"config":{},"type":"minecraft:heightmap"}},"type":"minecraft:decorated"}},"type":"minecraft:decorated"}].

 

I don't know if it is a bug, or I did something wrong in my code, but any help is welcomed !