✓ FREE ShopGUI+ - OFFICIAL BSMC RELEASE 1.59.1

When I do /shop it says; Shop failed to load. Please check the server log for errors.
But there are no errors in the console. Please help me!

Added plugin to server Keeps coming up with error in chat saying /Shop [Reload] Please fix.

https://pastebin.com/ks7MMmYr
Help me i get this error

[ShopGUIPlus] Task #20 for ShopGUIPlus v1.15.0 generated an exception
java.lang.NullPointerException: null
at org.bukkit.craftbukkit.v1_12_R1.entity.CraftHumanEntity.openInventory(CraftHumanEntity.java:186) ~[spigot.jar:git-Spigot-4bd94dc-fb414fe]
at net.brcdev.shopgui.util.InventoryUtils$1.run(InventoryUtils.java:53) ~[?:?]
at org.bukkit.craftbukkit.v1_12_R1.scheduler.CraftTask.run(CraftTask.java:71) ~[spigot.jar:git-Spigot-4bd94dc-fb414fe]
at org.bukkit.craftbukkit.v1_12_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:353) [spigot.jar:git-Spigot-4bd94dc-fb414fe]
at net.minecraft.server.v1_12_R1.MinecraftServer.D(MinecraftServer.java:739) [spigot.jar:git-Spigot-4bd94dc-fb414fe]
at net.minecraft.server.v1_12_R1.DedicatedServer.D(DedicatedServer.java:406) [spigot.jar:git-Spigot-4bd94dc-fb414fe]
at net.minecraft.server.v1_12_R1.MinecraftServer.C(MinecraftServer.java:679) [spigot.jar:git-Spigot-4bd94dc-fb414fe]
at net.minecraft.server.v1_12_R1.MinecraftServer.run(MinecraftServer.java:577) [spigot.jar:git-Spigot-4bd94dc-fb414fe]
at java.lang.Thread.run(Unknown Source) [?:1.8.0_161]
Can u help me please ?