I want to do make an arrow that summon at them position a particel cloud for very short time, but only when the arrow is in the air. 

What actually happened was...:
The command block give my an error and no one could say me what the problem is. 

Steps to Reproduce:
1. Do in a commandblock this command:

/execute at @e[type=arrow,nbt=\{OnGround=false}] run summon minecraft:area_effect_cloud ~ ~ ~ {Radius:0.1, Duration:5, Particle:"minecraft:flame"}