I experience the same problem and was asked to post the error log file. Hopefully it will help to locate the problem.

function: TCGMusicDefenitionsTCBoombox3068955583.lua -- file: TCGMusicDefenitionsTCBoombox3068955583.lua line # 3 | MOD: True Music: Mixtape Megapack B42

ERROR: General f:0, t:1755517330596> ExceptionLogger.logException> Exception thrown
java.lang.RuntimeException: attempted index of non-table at KahluaUtil.fail(KahluaUtil.java:101).
Stack trace:
se.krka.kahlua.vm.KahluaUtil.fail(KahluaUtil.java:101)
se.krka.kahlua.vm.KahluaUtil.luaAssert(KahluaUtil.java:89)
se.krka.kahlua.vm.KahluaThread.tableSet(KahluaThread.java:1567)
se.krka.kahlua.vm.KahluaThread.luaMainloop(KahluaThread.java:474)
se.krka.kahlua.vm.KahluaThread.call(KahluaThread.java:174)
se.krka.kahlua.vm.KahluaThread.pcall(KahluaThread.java:1826)
se.krka.kahlua.vm.KahluaThread.pcall(KahluaThread.java:1623)
se.krka.kahlua.integration.LuaCaller.pcall(LuaCaller.java:76)
se.krka.kahlua.integration.LuaCaller.protectedCall(LuaCaller.java:117)
zombie.Lua.LuaManager.RunLuaInternal(LuaManager.java:639)
zombie.Lua.LuaManager.RunLua(LuaManager.java:582)
zombie.Lua.LuaManager.RunLua(LuaManager.java:568)
zombie.Lua.LuaManager.LoadDirBase(LuaManager.java:427)
zombie.Lua.LuaManager.LoadDirBase(LuaManager.java:318)
zombie.Lua.LuaManager.LoadDirBase(LuaManager.java:479)
zombie.GameWindow.init(GameWindow.java:1386)
zombie.GameWindow.mainThreadInit(GameWindow.java:756)
zombie.GameWindow.mainThreadStart(GameWindow.java:598)
zombie.MainThread.mainLoop(MainThread.java:64)
java.base/java.lang.Thread.run(Unknown Source)
LOG : General f:0, t:1755517330596> -----------------------------------------
STACK TRACE
-----------------------------------------
function: TCGMusicDefenitionsTCBoombox3068955583.lua -- file: TCGMusicDefenitionsTCBoombox3068955583.lua line # 3 | MOD: True Music: Mixtape Megapack B42

Aug. 18, 2025 1:42:10 PM zombie.Lua.LuaManager RunLuaInternal
SCHWERWIEGEND: java.lang.RuntimeException
Aug. 18, 2025 1:42:10 PM zombie.Lua.LuaManager RunLuaInternal
SCHWERWIEGEND: java.lang.RuntimeException:
Aug. 18, 2025 1:42:10 PM zombie.Lua.LuaManager RunLuaInternal
SCHWERWIEGEND: at TCGMusicDefenitionsTCBoombox3068955583.lua:3

WARN : Lua f:0, t:1755517330616> LuaManager$GlobalObject.require > require("TCMusicDefenitions") failed
LOG : General f:0, t:1755517330616> -----------------------------------------
STACK TRACE
-----------------------------------------
function: TCGMusicDefenitionsTCBoombox3414427110.lua -- file: TCGMusicDefenitionsTCBoombox3414427110.lua line # 3 | MOD: True Music Addon: Pacific Drive

ERROR: General f:0, t:1755517330616> ExceptionLogger.logException> Exception thrown
java.lang.RuntimeException: attempted index of non-table at KahluaUtil.fail(KahluaUtil.java:101).
Stack trace:
se.krka.kahlua.vm.KahluaUtil.fail(KahluaUtil.java:101)
se.krka.kahlua.vm.KahluaUtil.luaAssert(KahluaUtil.java:89)
se.krka.kahlua.vm.KahluaThread.tableSet(KahluaThread.java:1567)
se.krka.kahlua.vm.KahluaThread.luaMainloop(KahluaThread.java:474)
se.krka.kahlua.vm.KahluaThread.call(KahluaThread.java:174)
se.krka.kahlua.vm.KahluaThread.pcall(KahluaThread.java:1826)
se.krka.kahlua.vm.KahluaThread.pcall(KahluaThread.java:1623)
se.krka.kahlua.integration.LuaCaller.pcall(LuaCaller.java:76)
se.krka.kahlua.integration.LuaCaller.protectedCall(LuaCaller.java:117)
zombie.Lua.LuaManager.RunLuaInternal(LuaManager.java:639)
zombie.Lua.LuaManager.RunLua(LuaManager.java:582)
zombie.Lua.LuaManager.RunLua(LuaManager.java:568)
zombie.Lua.LuaManager.LoadDirBase(LuaManager.java:427)
zombie.Lua.LuaManager.LoadDirBase(LuaManager.java:318)
zombie.Lua.LuaManager.LoadDirBase(LuaManager.java:479)
zombie.GameWindow.init(GameWindow.java:1386)
zombie.GameWindow.mainThreadInit(GameWindow.java:756)
zombie.GameWindow.mainThreadStart(GameWindow.java:598)
zombie.MainThread.mainLoop(MainThread.java:64)
java.base/java.lang.Thread.run(Unknown Source)
LOG : General f:0, t:1755517330616> -----------------------------------------
STACK TRACE
-----------------------------------------
function: TCGMusicDefenitionsTCBoombox3414427110.lua -- file: TCGMusicDefenitionsTCBoombox3414427110.lua line # 3 | MOD: True Music Addon: Pacific Drive

Aug. 18, 2025 1:42:10 PM zombie.Lua.LuaManager RunLuaInternal
SCHWERWIEGEND: java.lang.RuntimeException
Aug. 18, 2025 1:42:10 PM zombie.Lua.LuaManager RunLuaInternal
SCHWERWIEGEND: java.lang.RuntimeException:
Aug. 18, 2025 1:42:10 PM zombie.Lua.LuaManager RunLuaInternal
SCHWERWIEGEND: at TCGMusicDefenitionsTCBoombox3414427110.lua:3

WARN : Lua f:0, t:1755517330618> LuaManager$GlobalObject.require > require("TCMusicDefenitions") failed
WARN : Lua f:0, t:1755517331996> LuaManager$GlobalObject.require > require("BuildingObjects/ISAnimalPickMateCursor") failed
LOG : ExitDebug f:0, t:1755517332276> Events.OnKeyPressed.Add(ToggleEscapeMenu)
WARN : Lua f:0, t:1755517332817> LuaManager$GlobalObject.require > require("pzapi/ui/ui") failed
WARN : Lua f:0, t:1755517332925> LuaManager$GlobalObject.require > require("DAMN_MechOverlay") failed
WARN : Lua f:0, t:1755517332928> LuaManager$GlobalObject.require > require("DAMN_MechOverlay") failed
WARN : Lua f:0, t:1755517332928> LuaManager$GlobalObject.require > require("DAMN_MechOverlay") failed
WARN : Lua f:0, t:1755517332928> LuaManager$GlobalObject.require > require("DAMN_MechOverlay") failed
WARN : Lua f:0, t:1755517332928> LuaManager$GlobalObject.require > require("DAMN_MechOverlay") failed
WARN : Lua f:0, t:1755517332936> LuaManager$GlobalObject.require > require("DAMN_MechOverlay") failed
WARN : Lua f:0, t:1755517332943> LuaManager$GlobalObject.require > require("DAMN_MechOverlay") failed
WARN : Lua f:0, t:1755517332959> LuaManager$GlobalObject.require > require("EasyConfigChucked1_Main") failed
WARN : Lua f:0, t:1755517332963> LuaManager$GlobalObject.require > require("Maps/ISMapDefinitions") failed
WARN : Lua f:0, t:1755517332972> LuaManager$GlobalObject.require > require("recipecode") failed
LOG : General f:0, t:1755517332976> -----------------------------------------
STACK TRACE
-----------------------------------------

as you can see here:
"MOD: True Music: Mixtape Megapack B42" this error is not because of True Music. Its the megapack you are using as an addon.