minecraft command block problem "snowball"

I’m trying to execute this code:

execute @a[score_HoldSnowball_min=1] ~ ~ ~ scoreboard players set @e[type=Snowball,rm=3,r=4] Snowball 1 

but it doesn’t execute the code and instead says:

[13:59:43] Failed to execute 'scoreboard players set @e[type=Snowball,rm=3,r=4] Snowball 1' as xXElite_PythonXx

What is wrong with my code?