[16:25:43] [Server thread/ERROR]: null
 org.bukkit.command.CommandException: Unhandled exception executing 'pokecollector' in org.bukkit.craftbukkit.v1_16_R3.command.VanillaCommandWrapper(pokecollector)
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:163) ~[forge:?]
        at org.bukkit.craftbukkit.v1_16_R3.CraftServer.dispatchCommand(CraftServer.java:680) ~[forge:1.16.5-54d7a066]
        at net.minecraft.network.play.ServerPlayNetHandler.func_147361_d(ServerPlayNetHandler.java:1788) ~[?:?]
        at net.minecraft.network.play.ServerPlayNetHandler.func_244548_c(ServerPlayNetHandler.java:1650) ~[?:?]
        at net.minecraft.network.play.ServerPlayNetHandler.func_147354_a(ServerPlayNetHandler.java:1604) ~[?:?]
        at net.minecraft.network.play.client.CChatMessagePacket.func_148833_a(CChatMessagePacket.java:38) ~[?:?]
        at net.minecraft.network.play.client.CChatMessagePacket.func_148833_a(CChatMessagePacket.java:8) ~[?:?]
        at net.minecraft.network.PacketThreadUtil.func_225383_a(PacketThreadUtil.java:22) ~[?:?]
        at net.minecraft.util.concurrent.TickDelayedTask.run(SourceFile:18) ~[?:?]
        at net.minecraft.util.concurrent.ThreadTaskExecutor.func_213166_h(SourceFile:144) ~[?:?]
        at net.minecraft.util.concurrent.RecursiveEventLoop.func_213166_h(SourceFile:23) ~[?:?]
        at net.minecraft.server.MinecraftServer.func_213166_h(MinecraftServer.java:886) ~[?:?]
        at net.minecraft.server.MinecraftServer.func_213166_h(MinecraftServer.java:169) ~[?:?]
        at net.minecraft.util.concurrent.ThreadTaskExecutor.func_213168_p(SourceFile:118) ~[?:?]
        at net.minecraft.server.MinecraftServer.func_213205_aW(MinecraftServer.java:869) ~[?:?]
        at net.minecraft.server.MinecraftServer.func_213168_p(MinecraftServer.java:863) ~[?:?]
        at net.minecraft.util.concurrent.ThreadTaskExecutor.func_213161_c(SourceFile:127) ~[?:?]
        at net.minecraft.server.MinecraftServer.func_213202_o(MinecraftServer.java:849) ~[?:?]
        at net.minecraft.server.MinecraftServer.func_240802_v_(MinecraftServer.java:781) ~[?:?]
        at net.minecraft.server.MinecraftServer.func_240783_a_(MinecraftServer.java:265) ~[?:?]
        at java.lang.Thread.run(Thread.java:829) [?:?]
Caused by: java.lang.NoClassDefFoundError: me/clip/placeholderapi/PlaceholderAPI
        at com.envyful.placeholders.spigot.papi.extension.SpigotPAPIExtension.parse(SpigotPAPIExtension.java:29) ~[?:?]
        at com.envyful.placeholders.spigot.papi.extension.SpigotPAPIExtension.parse(SpigotPAPIExtension.java:11) ~[?:?]
        at com.envyful.papi.api.manager.AbstractPlaceholderManager.onPlaceholderRequested(AbstractPlaceholderManager.java:160) ~[forgeplaceholderapi:?]
        at com.envyful.papi.api.manager.AbstractPlaceholderManager.onPlaceholderRequest(AbstractPlaceholderManager.java:95) ~[forgeplaceholderapi:?]
        at com.envyful.papi.api.util.UtilPlaceholder.replaceIdentifiers(UtilPlaceholder.java:44) ~[forgeplaceholderapi:?]
        at com.envyful.menus.forge.data.impl.GroovyPlaceholderRequirement.fits(GroovyPlaceholderRequirement.java:36) ~[menus:?]
        at com.envyful.menus.forge.data.ConfigItem.canSee(ConfigItem.java:161) ~[menus:?]
        at com.envyful.menus.forge.data.ConfigItem.build(ConfigItem.java:100) ~[menus:?]
        at com.envyful.menus.forge.ui.GenericUI.placeElements(GenericUI.java:122) ~[menus:?]
        at com.envyful.menus.forge.ui.GenericUI.<init>(GenericUI.java:46) ~[menus:?]
        at com.envyful.menus.forge.data.Menu.open(Menu.java:166) ~[menus:?]
        at com.envyful.menus.forge.data.Menu.lambda$registerCommand$1(Menu.java:123) ~[menus:?]
        at com.mojang.brigadier.CommandDispatcher.execute(CommandDispatcher.java:262) ~[?:?]
        at net.minecraft.command.Commands.func_197059_a(Commands.java:266) ~[?:?]
        at net.minecraft.command.Commands.handleCommand(Commands.java:321) ~[?:?]
        at org.bukkit.craftbukkit.v1_16_R3.command.VanillaCommandWrapper.execute(VanillaCommandWrapper.java:44) ~[forge:?]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:156) ~[forge:?]
        ... 20 more