Couldn't pass ProxyInitializeEvent to anvil

[prototype464]

This error is displayed in console upon booting up Velocity (3.0.0):

[18:43:07 ERROR]: Couldn't pass ProxyInitializeEvent to anvil
java.lang.IllegalArgumentException: org.anvilpowered.anvil.velocity.command.VelocityCommandService$WrapperCommand@35a6504 does not implement a registrable Command subinterface
at com.velocitypowered.proxy.command.VelocityCommandManager.register(VelocityCommandManager.java:113) ~[velocity.jar:3.0.1-SNAPSHOT (git-f79736b8-b42)]
at com.velocitypowered.api.command.CommandManager.register(CommandManager.java:47) ~[velocity.jar:3.0.1-SNAPSHOT (git-f79736b8-b42)]
at org.anvilpowered.anvil.velocity.command.VelocityAnvilCommandNode.loadCommands(VelocityAnvilCommandNode.java:74) ~[?:?]
at org.anvilpowered.anvil.common.command.CommonAnvilCommandNode.lambda$new$0(CommonAnvilCommandNode.java:83) ~[?:?]
at org.anvilpowered.anvil.base.registry.BaseRegistry.lambda$null$1(BaseRegistry.java:213) ~[?:?]
at java.util.HashMap.forEach(HashMap.java:1425) ~[?:?]
at org.anvilpowered.anvil.base.registry.BaseRegistry.lambda$loadOrdinal$2(BaseRegistry.java:211) ~[?:?]
at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) ~[?:?]
at java.util.stream.SortedOps$SizedRefSortingSink.end(SortedOps.java:357) ~[?:?]
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:485) ~[?:?]
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474) ~[?:?]
at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) ~[?:?]
at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) ~[?:?]
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[?:?]
at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:596) ~[?:?]
at org.anvilpowered.anvil.base.registry.BaseRegistry.loadOrdinal(BaseRegistry.java:211) ~[?:?]
at org.anvilpowered.anvil.base.registry.BaseRegistry.load(BaseRegistry.java:205) ~[?:?]
at org.anvilpowered.anvil.base.registry.BaseExtendedRegistry.load(BaseExtendedRegistry.java:54) ~[?:?]
at org.anvilpowered.anvil.api.EnvironmentBuilderImpl.completeInitialization(EnvironmentBuilderImpl.java:148) ~[?:?]
at org.anvilpowered.anvil.velocity.AnvilVelocity.onInit(AnvilVelocity.java:56) ~[?:?]
at org.anvilpowered.anvil.velocity.Lmbda$1.execute(Unknown Source) ~[?:?]
at com.velocitypowered.proxy.event.UntargetedEventHandler$VoidHandler.lambda$buildHandler$0(UntargetedEventHandler.java:47) ~[velocity.jar:3.0.1-SNAPSHOT (git-f79736b8-b42)]
at com.velocitypowered.proxy.event.VelocityEventManager.fire(VelocityEventManager.java:589) ~[velocity.jar:3.0.1-SNAPSHOT (git-f79736b8-b42)]
at com.velocitypowered.proxy.event.VelocityEventManager.lambda$fire$6(VelocityEventManager.java:470) ~[velocity.jar:3.0.1-SNAPSHOT (git-f79736b8-b42)]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130) ~[?:?]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630) ~[?:?]
at java.lang.Thread.run(Thread.java:831) [?:?]

[benfoster04]

Duplicate of #43

[Glucy-2]

Same.
Anvil 0.3.0
Velocity 3.0.0

[alexstaeding]

Fixed by #64