I'm getting the below error. Any ideas?

`attempted index: items of non-table: null
function: west_point_expansion_lootmap_saltridge.lua -- file: west_point_expansion_lootmap_saltridge.lua line # 3 | MOD: West Point Expansion Addon - Salt Ridge Loot Map (v1.1)
java.lang.RuntimeException: attempted index: items of non-table: null
at se.krka.kahlua.vm.KahluaThread.tableget(KahluaThread.java:1689)
at se.krka.kahlua.vm.KahluaThread.luaMainloop(KahluaThread.java:492)
at se.krka.kahlua.vm.KahluaThread.call(KahluaThread.java:163)
at se.krka.kahlua.vm.KahluaThread.pcall(KahluaThread.java:1980)
at se.krka.kahlua.vm.KahluaThread.pcall(KahluaThread.java:1782)
at se.krka.kahlua.integration.LuaCaller.pcall(LuaCaller.java:76)
at se.krka.kahlua.integration.LuaCaller.protectedCall(LuaCaller.java:117)
at zombie.Lua.LuaManager.RunLuaInternal(LuaManager.java:563)
at zombie.Lua.LuaManager.RunLua(LuaManager.java:509)
at zombie.Lua.LuaManager.RunLua(LuaManager.java:495)
at zombie.Lua.LuaManager.LoadDirBase(LuaManager.java:341)
at zombie.Lua.LuaManager.LoadDirBase(LuaManager.java:263)
at zombie.gameStates.GameLoadingState.enter(GameLoadingState.java:97)
at zombie.gameStates.GameStateMachine.update(GameStateMachine.java:145)
at zombie.GameWindow.logic(GameWindow.java:298)
at zombie.core.profiling.AbstractPerformanceProfileProbe.invokeAndMeasure(AbstractPerformanceProfileProbe.java:71)
at zombie.GameWindow.frameStep(GameWindow.java:765)
at zombie.GameWindow.run_ez(GameWindow.java:667)
at zombie.GameWindow.mainThread(GameWindow.java:495)
at java.base/java.lang.Thread.run(Unknown Source)
`