I can't understand what i do wrong

i was trying to make assault meteor gun, can anyone help?
/spawnitem rareassaultrifle 1 '{"level":10,"shortdescription":"The Revenger","rarity":"Essential","animationParts":{"butt":"/items/active/weapons/ranged/assaultrifle/butt/7.png","middle":"/items/active/weapons/ranged/assaultrifle/middle/4.png","barrel":"/items/active/weapons/ranged/assaultrifle/barrel/7.png"},"animationCustom":{"sounds":{"fire":["/sfx/projectiles/throw_item_small.ogg"]}{"altfire":["/sfx/projectiles/throw_item_large.ogg"]}},"primaryAbility":{"fireTime":0,"projectileCount":20,"inaccuracy":0,"baseDps":100000000000,"projectileType":"smallmeteor","projectileParameters":{"speed":99999999,"power":9999,"knockback":9999}}"altAbilityType":"explosiveshot","altAbility":{"fireTime":2,"projectileCount":1,"inaccuracy":0,"baseDps":100000000000,"projectileType":"largemeteor","projectileParameters":{"speed":99999999,"power":9999,"knockback":9999}}}'