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    Thrown to indicate that a method has been passed an illegal or inappropriate argument. Check that you don't have more than one method existing with the same name.

Solutions on the web

via GitHub by sebastianbinder
, 1 year ago
java.lang.IllegalArgumentException: object is not an instance of declaring class
via GitHub by markhughes
, 1 year ago
java.lang.IllegalArgumentException: object is not an instance of declaring class
java.lang.RuntimeException: java.lang.IllegalArgumentException: object is not an instance of declaring class at org.inventivetalent.mapmanager.TimingsHelper.startTiming(TimingsHelper.java:27)[?:?] at org.inventivetalent.animatedframes.AnimatedFrame$1.run(AnimatedFrame.java:310)[?:?] at org.bukkit.craftbukkit.v1_10_R1.scheduler.CraftTask.run(CraftTask.java:58)[patched_1.10.2.jar:git-Paper-819] at org.bukkit.craftbukkit.v1_10_R1.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:352)[patched_1.10.2.jar:git-Paper-819] at net.minecraft.server.v1_10_R1.MinecraftServer.D(MinecraftServer.java:781)[patched_1.10.2.jar:git-Paper-819] at net.minecraft.server.v1_10_R1.DedicatedServer.D(DedicatedServer.java:404)[patched_1.10.2.jar:git-Paper-819] at net.minecraft.server.v1_10_R1.MinecraftServer.C(MinecraftServer.java:725)[patched_1.10.2.jar:git-Paper-819] at net.minecraft.server.v1_10_R1.MinecraftServer.run(MinecraftServer.java:624)[patched_1.10.2.jar:git-Paper-819] at java.lang.Thread.run(Unknown Source)[?:1.8.0_91]Caused by: java.lang.IllegalArgumentException: object is not an instance of declaring class at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)[?:1.8.0_91] at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)[?:1.8.0_91] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)[?:1.8.0_91] at java.lang.reflect.Method.invoke(Unknown Source)[?:1.8.0_91] at org.inventivetalent.mapmanager.TimingsHelper.startTiming(TimingsHelper.java:25)[?:?] ... 8 more