It's StackZ now, not VoltZ.

source/screens/scriptBrowse.cpp

@@ -1,6 +1,6 @@
 /*
 *   This file is part of Universal-Updater
-*   Copyright (C) 2019 VoltZ, Epicpkmn11, Flame, RocketRobz, TotallyNotGuy
+*   Copyright (C) 2019 DeadPhoenix8091, Epicpkmn11, Flame, RocketRobz, StackZ, TotallyNotGuy
 *
 *   This program is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
@@ -40,7 +40,6 @@ nlohmann::json infoJson;
 
 #define metaFile "sdmc:/3ds/Universal-Updater/ScriptInfo.json"
 
-extern std::string get(nlohmann::json json, const std::string &key, const std::string &key2);
 std::string maxScripts;
 
 void fixInfo(nlohmann::json &json) {