not sure what this is but any help would be nice please

[Chucky891]

[BossShopPro] Plugin BossShopPro v2.0.9 generated an exception while executing task 64
java.lang.NullPointerException: Cannot invoke "java.util.List.add(int, Object)" because "list" is null
at org.black_ixx.bossshop.addon.playershops.objects.PlayerShopItem.createShopItemNormal(PlayerShopItem.java:152) ~[BSP-PlayerShops.jar:?]
at org.black_ixx.bossshop.addon.playershops.managers.ShopCreator.createShop(ShopCreator.java:73) ~[BSP-PlayerShops.jar:?]
at org.black_ixx.bossshop.addon.playershops.objects.PlayerShop.createShop(PlayerShop.java:170) ~[BSP-PlayerShops.jar:?]
at org.black_ixx.bossshop.addon.playershops.managers.SaveManager.loadShop(SaveManager.java:55) ~[BSP-PlayerShops.jar:?]
at org.black_ixx.bossshop.addon.playershops.managers.PlayerShopsManager.loadFile(PlayerShopsManager.java:75) ~[BSP-PlayerShops.jar:?]
at org.black_ixx.bossshop.addon.playershops.managers.PlayerShopsManager.loadFile(PlayerShopsManager.java:70) ~[BSP-PlayerShops.jar:?]
at org.black_ixx.bossshop.addon.playershops.managers.PlayerShopsManager.loadFile(PlayerShopsManager.java:70) ~[BSP-PlayerShops.jar:?]
at org.black_ixx.bossshop.addon.playershops.managers.PlayerShopsManager.init(PlayerShopsManager.java:59) ~[BSP-PlayerShops.jar:?]
at org.black_ixx.bossshop.addon.playershops.PlayerShops.load(PlayerShops.java:90) ~[BSP-PlayerShops.jar:?]
at org.black_ixx.bossshop.addon.playershops.PlayerShops.bossShopFinishedLoading(PlayerShops.java:58) ~[BSP-PlayerShops.jar:?]
at org.black_ixx.bossshop.managers.ClassManager.setupDependentClasses(ClassManager.java:176) ~[BossShopPro.jar:?]
at org.black_ixx.bossshop.BossShop$1.run(BossShop.java:79) ~[BossShopPro.jar:?]
at org.bukkit.craftbukkit.v1_18_R1.scheduler.CraftTask.run(CraftTask.java:101) ~[paper-1.18.1.jar:git-Paper-197]
at org.bukkit.craftbukkit.v1_18_R1.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:57) ~[paper-1.18.1.jar:git-Paper-197]
at com.destroystokyo.paper.ServerSchedulerReportingWrapper.run(ServerSchedulerReportingWrapper.java:22) ~[paper-1.18.1.jar:git-Paper-197]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136) ~[?:?]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) ~[?:?]
at java.lang.Thread.run(Thread.java:833) ~[?:?]
mv conf enablebuscript false