java.lang.NullPointerException: Cannot invoke "java.lang.Class.getDeclaredConstructor(java.lang.Class[])" because "org.maxgamer.quickshop.util.ItemNMS.nbtTagCompoundClass" is null
  org.maxgamer.quickshop.util.ItemNMS.saveJsonfromNMS (ItemNMS.java:78)
  org.maxgamer.quickshop.chat.platform.minedown.BungeeQuickChat.sendItemHologramChat (BungeeQuickChat.java:75)
  org.maxgamer.quickshop.util.MsgUtil.flush (MsgUtil.java:125)
  org.maxgamer.quickshop.listener.PlayerListener.onJoin (PlayerListener.java:270)
  com.destroystokyo.paper.event.executor.asm.generated.GeneratedEventExecutor634.execute ([unknown]:-1)
  org.bukkit.plugin.EventExecutor.lambda$create$1 (EventExecutor.java:69)
  org.bukkit.plugin.EventExecutor$$Lambda$4879/0x0000000089e804d8.execute ([unknown]:-1)
  co.aikar.timings.TimedEventExecutor.execute (TimedEventExecutor.java:80)
  org.bukkit.plugin.RegisteredListener.callEvent (RegisteredListener.java:70)
  org.bukkit.plugin.SimplePluginManager.callEvent (SimplePluginManager.java:624)
  net.minecraft.server.players.PlayerList.postChunkLoadJoin (PlayerList.java:359)
  net.minecraft.server.players.PlayerList.lambda$placeNewPlayer$1 (PlayerList.java:301)
  net.minecraft.server.players.PlayerList$$Lambda$7635/0x00000000352d03d8.run ([unknown]:-1)
  net.minecraft.server.network.PlayerConnection.tick (PlayerConnection.java:307)
  net.minecraft.network.NetworkManager.a (NetworkManager.java:399)
  net.minecraft.server.network.ServerConnection.c (ServerConnection.java:196)
  net.minecraft.server.MinecraftServer.b (MinecraftServer.java:1578)
  net.minecraft.server.dedicated.DedicatedServer.b (DedicatedServer.java:479)
  net.minecraft.server.MinecraftServer.a (MinecraftServer.java:1406)
  net.minecraft.server.MinecraftServer.x (MinecraftServer.java:1188)
  net.minecraft.server.MinecraftServer.lambda$spin$0 (MinecraftServer.java:316)
  net.minecraft.server.MinecraftServer$$Lambda$3653/0x0000000021f39d18.run ([unknown]:-1)
  java.lang.Thread.run ([unknown]:-1)