This is the error I got from my console for 1.16.5, and for some reason skill API placeholder does not work.
Plugin ver: R4 1.1
Console:
[20:30:46] [Server thread/WARN]: Failed to set up reflection for scoreboards - restoring to slow method
[20:30:46] [Server thread/INFO]: Please send this stacktrace to a developer.
[20:30:46] [Server thread/WARN]: java.lang.ClassNotFoundException: net.minecraft.world.scores.criteria.IScoreboardCriteria
[20:30:46] [Server thread/WARN]: at org.bukkit.plugin.java.PluginClassLoader.loadClass0(PluginClassLoader.java:155)
[20:30:46] [Server thread/WARN]: at org.bukkit.plugin.java.PluginClassLoader.loadClass(PluginClassLoader.java:114)
[20:30:46] [Server thread/WARN]: at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:519)
[20:30:46] [Server thread/WARN]: at java.base/java.lang.Class.forName0(Native Method)
[20:30:46] [Server thread/WARN]: at java.base/java.lang.Class.forName(Class.java:375)
[20:30:46] [Server thread/WARN]: at mc.promcteam.engine.mccore.scoreboard.Board.init(Board.java:114)
[20:30:46] [Server thread/WARN]: at mc.promcteam.engine.mccore.scoreboard.BoardManager.init(BoardManager.java:60)
[20:30:46] [Server thread/WARN]: at com.sucy.skill.manager.ClassBoardManager.registerText(ClassBoardManager.java:136)
[20:30:46] [Server thread/WARN]: at com.sucy.skill.SkillAPI.onEnable(SkillAPI.java:579)
[20:30:46] [Server thread/WARN]: at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:263)
[20:30:46] [Server thread/WARN]: at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:370)
[20:30:46] [Server thread/WARN]: at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:500)
[20:30:46] [Server thread/WARN]: at org.bukkit.craftbukkit.v1_16_R3.CraftServer.enablePlugin(CraftServer.java:518)
[20:30:46] [Server thread/WARN]: at org.bukkit.craftbukkit.v1_16_R3.CraftServer.enablePlugins(CraftServer.java:432)
[20:30:46] [Server thread/WARN]: at net.minecraft.server.v1_16_R3.MinecraftServer.loadWorld(MinecraftServer.java:599)
[20:30:46] [Server thread/WARN]: at net.minecraft.server.v1_16_R3.DedicatedServer.init(DedicatedServer.java:298)
[20:30:46] [Server thread/WARN]: at net.minecraft.server.v1_16_R3.MinecraftServer.w(MinecraftServer.java:1074)
[20:30:46] [Server thread/WARN]: at net.minecraft.server.v1_16_R3.MinecraftServer.lambda$a$0(MinecraftServer.java:291)
[20:30:46] [Server thread/WARN]: at java.base/java.lang.Thread.run(Thread.java:831)
This is the error I got from my console for 1.16.5, and for some reason skill API placeholder does not work. Plugin ver: R4 1.1 Console: [20:30:46] [Server thread/WARN]: Failed to set up reflection for scoreboards - restoring to slow method [20:30:46] [Server thread/INFO]: Please send this stacktrace to a developer. [20:30:46] [Server thread/WARN]: java.lang.ClassNotFoundException: net.minecraft.world.scores.criteria.IScoreboardCriteria [20:30:46] [Server thread/WARN]: at org.bukkit.plugin.java.PluginClassLoader.loadClass0(PluginClassLoader.java:155) [20:30:46] [Server thread/WARN]: at org.bukkit.plugin.java.PluginClassLoader.loadClass(PluginClassLoader.java:114) [20:30:46] [Server thread/WARN]: at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:519) [20:30:46] [Server thread/WARN]: at java.base/java.lang.Class.forName0(Native Method) [20:30:46] [Server thread/WARN]: at java.base/java.lang.Class.forName(Class.java:375) [20:30:46] [Server thread/WARN]: at mc.promcteam.engine.mccore.scoreboard.Board.init(Board.java:114) [20:30:46] [Server thread/WARN]: at mc.promcteam.engine.mccore.scoreboard.BoardManager.init(BoardManager.java:60) [20:30:46] [Server thread/WARN]: at com.sucy.skill.manager.ClassBoardManager.registerText(ClassBoardManager.java:136) [20:30:46] [Server thread/WARN]: at com.sucy.skill.SkillAPI.onEnable(SkillAPI.java:579) [20:30:46] [Server thread/WARN]: at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:263) [20:30:46] [Server thread/WARN]: at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:370) [20:30:46] [Server thread/WARN]: at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:500) [20:30:46] [Server thread/WARN]: at org.bukkit.craftbukkit.v1_16_R3.CraftServer.enablePlugin(CraftServer.java:518) [20:30:46] [Server thread/WARN]: at org.bukkit.craftbukkit.v1_16_R3.CraftServer.enablePlugins(CraftServer.java:432) [20:30:46] [Server thread/WARN]: at net.minecraft.server.v1_16_R3.MinecraftServer.loadWorld(MinecraftServer.java:599) [20:30:46] [Server thread/WARN]: at net.minecraft.server.v1_16_R3.DedicatedServer.init(DedicatedServer.java:298) [20:30:46] [Server thread/WARN]: at net.minecraft.server.v1_16_R3.MinecraftServer.w(MinecraftServer.java:1074) [20:30:46] [Server thread/WARN]: at net.minecraft.server.v1_16_R3.MinecraftServer.lambda$a$0(MinecraftServer.java:291) [20:30:46] [Server thread/WARN]: at java.base/java.lang.Thread.run(Thread.java:831)