Getting ERROR due to a false Duplicated permission

Hi! Love this plugin! Been working amazing until today.
So, since today when it's loaded the console returns this message:
Duplicate permission registered 'steamchecks.skip' (by plugin 'Steam Checks')
The plugin remains loaded and every time a player joins this error happens:
[Steam Checks] Error while contacting the SteamAPI. Error: SteamID: 765614747545 - Function: GetPlayerBans - ErrorCode: InternalError.
(the SteamID number is just an example)
Other times I get the same message but with: ErrorCode: 504

Already checked this on console: oxide.show perm steamchecks.skip
Console's Answer:
Permission 'steamchecks.skip' Players:
No players with this permission
Permission 'steamchecks.skip' Groups:
No groups with this permission

I use the PermissionManager plugin, so it was also easy to check that steamchecks.skip isn't been granted to no one.

Already removed both: SteamChecks.cs and config SteamChecks.json files (from their respective folders).
Downloaded again fromΒ https://umod.org/plugins/steam-checks
Loaded once to get a new config SteamChecks.json file.
Got the obvious: [Steam Checks] The API key you supplied in the config is empty.. register one here https://steamcommunity.com/dev/apikey
Added my valid API Key that I'm also using with the SkinBox plugin and it's working perfectly.
Loaded the plugin again.
Got the duplicate permission message from the console: Duplicate permission registered 'steamchecks.skip' (by plugin 'Steam Checks')

This is my config file:
{
"AdditionalKickMessage": "",
"ApiKey": "",
"BroadcastKick": false,
"CacheDeniedPlayers": false,
"CachePassedPlayers": true,
"CheckPlayersOnRespawn": false,
"DiscordRolesToMention": [],
"discordWebHookUrl": "",
"Kicking": {
"CommunityBan": true,
"TradeBan": true,
"PrivateProfile": false,
"LimitedAccount": false,
"NoProfile": false,
"FamilyShare": false,
"ForceHoursPlayedKick": false
},
"LogInsteadofKick": false,
"Thresholds": {
"MaxVACBans": 0,
"MinDaysSinceLastBan": -1,
"MaxGameBans": 0,
"MinSteamLevel": -1,
"MaxAccountCreationTime": -1,
"MinGameCount": -1,
"MinRustHoursPlayed": -1,
"MaxRustHoursPlayed": -1,
"MinOtherGamesPlayed": -1,
"MinAllGamesHoursPlayed": -1
}
}

Please, any help you can provide will be highly appreciated.

I will look into this.

This last few days the ErrorCodeΒ I'm getting is: ErrorCode: Forbidden. πŸ˜•