Remove cache from atlasJSONHash

[fitness23]

I have successfully loaded in a number of pngs and json files by using the following in a loop through JSON:

this.game.load.atlasJSONHash(gameData.npc[i].animID, "assets/images/npcs/"+gameData.npc[i].animImagePath+"", "js/npcs/"+gameData.npc[i].animDataPath+"");

Then I am successful in removing the sprite from the scene using the following:

item.destroy();

However when I try to then remove the png and json atlas json files from the cache, it errors, any ideas? I am using the following:

this.game.cache.removeTextureAtlas(gameData.npc[i].animID);