[20:10:07 ERROR]: Error occurred while enabling KnockbackSync v1.3.6-dev-b138 (Is it up to date?)
java.lang.IllegalStateException: java.lang.NullPointerException: Cannot invoke "java.lang.Class.getConstructor(java.lang.Class[])" because "me.caseload.knockbacksync.shaded.io.github.retrooper.packetevents.util.SpigotReflectionUtil.NMS_ITEM_STACK_CLASS" is null
at knockbacksync-bukkit-1.3.6-dev-b138.jar//me.caseload.knockbacksync.shaded.io.github.retrooper.packetevents.factory.spigot.SpigotPacketEventsBuilder$1.load(SpigotPacketEventsBuilder.java:121) ~[?:?]
at knockbacksync-bukkit-1.3.6-dev-b138.jar//me.caseload.knockbacksync.shaded.io.github.retrooper.packetevents.factory.spigot.SpigotPacketEventsBuilder$1.init(SpigotPacketEventsBuilder.java:166) ~[?:?]
at knockbacksync-bukkit-1.3.6-dev-b138.jar//me.caseload.knockbacksync.Base.initializePacketEvents(Base.java:114) ~[?:?]
at knockbacksync-bukkit-1.3.6-dev-b138.jar//me.caseload.knockbacksync.Base.enable(Base.java:97) ~[?:?]
at knockbacksync-bukkit-1.3.6-dev-b138.jar//me.caseload.knockbacksync.BukkitBase.enable(BukkitBase.java:126) ~[?:?]
at knockbacksync-bukkit-1.3.6-dev-b138.jar//me.caseload.knockbacksync.BukkitLoaderPlugin.onEnable(BukkitLoaderPlugin.java:17) ~[?:?]
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:279) ~[paper-api-26.2.build.24-alpha.jar:?]
at io.papermc.paper.plugin.manager.PaperPluginInstanceManager.enablePlugin(PaperPluginInstanceManager.java:207) ~[paper-26.2.jar:26.2-24-1e3ffb9]
at io.papermc.paper.plugin.manager.PaperPluginManagerImpl.enablePlugin(PaperPluginManagerImpl.java:109) ~[paper-26.2.jar:26.2-24-1e3ffb9]
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:520) ~[paper-api-26.2.build.24-alpha.jar:?]
at org.bukkit.craftbukkit.CraftServer.enablePlugin(CraftServer.java:633) ~[paper-26.2.jar:26.2-24-1e3ffb9]
at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:590) ~[paper-26.2.jar:26.2-24-1e3ffb9]
at net.minecraft.server.MinecraftServer.initPostWorld(MinecraftServer.java:672) ~[paper-26.2.jar:26.2-24-1e3ffb9]
at net.minecraft.server.dedicated.DedicatedServer.initServer(DedicatedServer.java:343) ~[paper-26.2.jar:26.2-24-1e3ffb9]
at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1290) ~[paper-26.2.jar:26.2-24-1e3ffb9]
at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:302) ~[paper-26.2.jar:26.2-24-1e3ffb9]
at java.base/java.lang.Thread.run(Thread.java:1474) ~[?:?]
Caused by: java.lang.NullPointerException: Cannot invoke "java.lang.Class.getConstructor(java.lang.Class[])" because "me.caseload.knockbacksync.shaded.io.github.retrooper.packetevents.util.SpigotReflectionUtil.NMS_ITEM_STACK_CLASS" is null
at knockbacksync-bukkit-1.3.6-dev-b138.jar//me.caseload.knockbacksync.shaded.io.github.retrooper.packetevents.util.SpigotReflectionUtil.initConstructors(SpigotReflectionUtil.java:160) ~[?:?]
at knockbacksync-bukkit-1.3.6-dev-b138.jar//me.caseload.knockbacksync.shaded.io.github.retrooper.packetevents.util.SpigotReflectionUtil.init(SpigotReflectionUtil.java:465) ~[?:?]
at knockbacksync-bukkit-1.3.6-dev-b138.jar//me.caseload.knockbacksync.shaded.io.github.retrooper.packetevents.factory.spigot.SpigotPacketEventsBuilder$1.load(SpigotPacketEventsBuilder.java:116) ~[?:?]
... 16 more
[20:10:07 INFO]: [KnockbackSync] Disabling KnockbackSync v1.3.6-dev-b138
this is my log: