In future, please check your config file fully before reporting issues, this is taken directly from your config file:
"Reward Options": {
"Rewards Plugin (ServerRewards | Economics)": "Economics",
"Currency Unit Displayed e.g: RP | $": "RP",
"Enable Rewards": false,
"Share Reward Between Players Above Damage Threshold": true,
"Plugin to Use For Awarding XP (SkillTree | XPerience)": "SkillTree",
"Enable XP Reward": false,
"Share XP Between Players Above Damage Threshold": false,
"Award XP Including Players Existing Boosts": false,
"Enable Scrap Reward": false,
"Share Scrap Between Players Above Damage Threshold": false,
"Enable Custom Reward Currency": false,
"Share Custom Reward Between Players Above Damage Threshold": false,
"Custom Reward Currency Item": {
"ShortName": "item.shortname",
"SkinID": 0,
"Custom Display Name (leave blank unless creating custom items)": ""
},
"Rewards multipliers by permission": {
"bradleydrops.examplevip1": 1.0,
"bradleydrops.examplevip2": 1.0,
"bradleydrops.examplevip3": 1.0
}
},