After editing config file I get "Your configuration file contains an error. Using default configuration values." Please point out the error to me. (Unexperienced coder trying to learn.)Solved

Okay so i'm trying to install this one because it's a basic on all modded servers. 
I've managed to set up the permissions correctly, no trouble there. 
My config of the plugin is down below. Edited it as i want it.   
Then i reload the plugin using "O.reload QuickSmelt", and i get this error message just saying "Your configuration file contains an error. Using default configuration values." 
I'm trying to learn this coding language and have only coded in lua before when making a gmod server. Could you please give me some feedback and perhaps point out where the error is? Thank you for this addon and hope i'll get a response <3

{
"Use Permission": true,
"Speed Multipliers": {
"global": 5.0,
"furnace, furnace.large": 1.0
},
"Fuel Usage Speed Multipliers": {
"global": 0.5,
"furnace, furnace.large": 1.0
},
"Fuel Usage Multipliers": {
"global": 0.5,
"furnace, furnace.large": 1
},
"Output Multipliers": {
"global": {
"global": 5.0
},
"furnace, furnace.large": {
"furnace, furnace.large": 1.0
}
},
"Whitelist": {
"global": [
""
],
"": [
""
]
},
"Blacklist": {
"global": [
""
],
"": [
""
]
},
"Smelting Frequencies (Smelt items every N smelting ticks)": {
"global": 5,
"furnace, furnace.large": 1
},
"Debug": false
}

Just copied&Pasted from someone else who got it working, i'm learning from his code. Thank you.

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