Json Encode problems while using Google Firebase, is there any solutions?

Today i just started using Google Firebase, after finding out it could help my problem with quick data transfer between servers. I am trying to use Google Firebase to get data quickly from server to server, but ran into this problem when i tried using the module script for this. Apparently trying to call one of the functions to give data always led to an error.

I would very much appreciate it if someone with experience with Firebase could give their advice on how to solve this problem. And underneath this is both the script and module script i used.

Here is the Script that uses the module script:

1local Data = require(script.Firebase)
2local Url = "https://project-siege.firebaseio.com/"
3 
4 
5Data.Init(Url)
6 
7Data:Patch("users/4402987",{level = 9000, name = "astrallife"})

And here is the Module script itself: https://www.roblox.com/catalog/297221345/Rukiryos-Firebase-Module

I will still show the rest of the script here, for your convenience.

001local module = {}
002 
003--Written by Rukiryo
004 
005--------------------------------------------------
006--------------------EXAMPLES----------------------
007--------------------------------------------------
008--[[
009 
010    Basic Initialization
011        local data = require(game.Workspace.Firebase)
012        local url = 'https://your-firebase-url.firebaseio.com/'
013        data.Init(url)
014        data.Authenticate("my secret token") -- Optional but recommended
015 
016    Adding data for somebody
017        module.Put("users/4402987",{level = 5, age = 19, name = "Rukiryo"})
018 
019    Deleting somebody's data
020        module.Delete("users/4402987")
021 
022    Getting someone's data
023        module.Get("users/4402987")
024 
025    You can put to any directory you want, even those that don't exist!
026 
027        module.Put("newsubtable/tableitem",{value = 5})
028]]
029--------------------------------------------------
030----------------------API-------------------------
031--------------------------------------------------
032--[[
033INIT
034void Init (string url)
035--Give the module a string to append before each request. If you wish to manually enter the url each time, do not call Init.
036 
037AUTHENTICATE
038void Authenticate(string key)
039--Appends a key to the end of requests. The key should be your security token. Read the Security section below for more.
040 
041POST
042table Post(string path, table data, string header = "")
043--Posts data. Returns data written (for verification). Post overwrites any info.
044Returns name of data put: { "name": "-INOQPH-aV_psbk3ZXEX" } If you do not wish to receive a weird string, use PUT.
045 
046PUT
047table Put(string path, table data)
048--Puts data. Data will be overwritten at the path specified. All names will be set as you specify, no weird string.
049Returns table containing information put (for verification)
050 
051GET
052table Get(string path)
053--Gets data. Returns requested data.
054 
055PATCH
056table Patch(string path, table data)
057--Patches data. Lets you update children without erasing content you do not mention. Creates new children that didn't exist previously.
058 
059DELETE
060void Delete(string path)
061--Deletes the specified path. 
062 
063 
064]]
065--------------------------------------------------
066------------------Security------------------------
067--------------------------------------------------
068--[[
069For help setting up security, visit https://www.firebase.com/docs/security/quickstart.html
070If your wish to use my module's built in security, I've written a basic passworded protection code snippet.
071This snippet will protect your entire database under a "Secret" token. This is available in your database.
072This security rule will allow your data to be posted to / read only with an authentication key.
073 
074[code starts here]
075 
076{
077    "rules": {
078        ".read": "auth != null && auth == 'YOUR SECRET TOKEN HERE'",
079        ".write": "auth != null && auth == 'YOUR SECRET TOKEN HERE'"
080    }
081}
082 
083[code ends here. do not paste these tags]
084 
085]]
086--------------------------------------------------
087--------------------------------------------------
088--------------------------------------------------
089 
090module.url = ""
091module.http = nil
092module.auth = ""
093 
094module.Init = function(u)
095    module.url = u
096    module.http = game:GetService("HttpService")
097end
098 
099module.Authenticate = function(key)
100    module.auth = key
101end
102 
103module.Post = function(path, data, header)
104    if header == nil then header = "" end
105    local jData = module.http:JSONEncode(data)
106    local finalPath = module.AuthKey(module.url..path..".json"..header)
107    --print(finalPath)
108    return module.http:PostAsync(finalPath, jData)
109end
110 
111module.Get = function(path)
112    local sendData = module.AuthKey(module.url..path..".json")
113    --print(sendData)
114    local gottenData = module.http:GetAsync(sendData)
115    --print(gottenData)
116    if gottenData ~= "null" then
117        return module.http:JSONDecode(gottenData)
118    end
119    return nil
120end
121 
122module.Put = function(path, data)
123    return module.Post(path, data, "?x-http-method-override=PUT") 
124end
125 
126module.Patch = function(path, data)
127    return module.Post(path, data, "?x-http-method-override=PATCH")
128end
129 
130module.Delete = function(path)
131    return module.http:PostAsync(module.AuthKey(module.url..path..".json?x-http-method-override=DELETE"), module.http:JSONEncode({}))
132end
133 
134module.AuthKey = function(str)
135    if module.auth == "" then return str end
136    if str.find(str, "?") ~= nil then
137        return str.."&auth="..module.auth
138    else
139        return str.."?auth="..module.auth
140    end
141end
142 
143 
144return module
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Json Encode problems while using Google Firebase, is there any solutions?

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