errores de siempre

>.... [00:22:28 WARN]: [CitizensGUI] Plugin CitizensGUI v1.4 generated an exception while executing task 9430
java.lang.IllegalStateException: NPCAddTraitEvent may only be triggered synchronously.
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:595) ~[patched_1.16.3.jar:git-Paper-207]
at net.citizensnpcs.api.npc.AbstractNPC.addTrait(AbstractNPC.java:124) ~[?:?]
at net.citizensnpcs.api.npc.AbstractNPC.getOrAddTrait(AbstractNPC.java:243) ~[?:?]
at net.citizensnpcs.api.npc.AbstractNPC.getTrait(AbstractNPC.java:256) ~[?:?]
at fr.ender_griefeur99.citizensgui.NearsCitizensGUI.itemMenu(NearsCitizensGUI.java:161) ~[?:?]
at fr.ender_griefeur99.citizensgui.NearsCitizensGUI$1.run(NearsCitizensGUI.java:86) ~[?:?]
at org.bukkit.craftbukkit.v1_16_R2.scheduler.CraftTask.run(CraftTask.java:99) ~[patched_1.16.3.jar:git-Paper-207]
at org.bukkit.craftbukkit.v1_16_R2.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:54) ~[patched_1.16.3.jar:git-Paper-207]
at com.destroystokyo.paper.ServerSchedulerReportingWrapper.run(ServerSchedulerReportingWrapper.java:22) ~[patched_1.16.3.jar:git-Paper-207]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_262]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_262]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_262]