[18:47:06 ERROR]: [io.papermc.paper.plugin.provider.source.DirectoryProviderSource] Error loading plugin: File 'plugins\test.jar' failed to load!

java.lang.RuntimeException: File 'plugins\test.jar' failed to load!

        at io.papermc.paper.plugin.provider.source.FileProviderSource.registerProviders(FileProviderSource.java:59) ~[paper-1.19.3.jar:git-Paper-448]

        at io.papermc.paper.plugin.provider.source.DirectoryProviderSource.lambda$registerProviders$2(DirectoryProviderSource.java:32) ~[paper-1.19.3.jar:git-Paper-448]

        at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) ~[?:?]

        at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:179) ~[?:?]

        at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197) ~[?:?]

        at java.util.Iterator.forEachRemaining(Iterator.java:133) ~[?:?]

        at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1921) ~[?:?]

        at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509) ~[?:?]

        at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499) ~[?:?]

        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 io.papermc.paper.plugin.provider.source.DirectoryProviderSource.registerProviders(DirectoryProviderSource.java:30) ~[paper-1.19.3.jar:git-Paper-448]

        at io.papermc.paper.plugin.provider.source.DirectoryProviderSource.registerProviders(DirectoryProviderSource.java:14) ~[paper-1.19.3.jar:git-Paper-448]

        at io.papermc.paper.plugin.util.EntrypointUtil.registerProvidersFromSource(EntrypointUtil.java:14) ~[paper-1.19.3.jar:git-Paper-448]

        at io.papermc.paper.plugin.PluginInitializerManager.load(PluginInitializerManager.java:100) ~[paper-1.19.3.jar:git-Paper-448]

        at net.minecraft.server.Main.main(Main.java:114) ~[paper-1.19.3.jar:git-Paper-448]

        at org.bukkit.craftbukkit.Main.main(Main.java:302) ~[paper-1.19.3.jar:git-Paper-448]

        at io.papermc.paperclip.Paperclip.lambda$main$0(Paperclip.java:42) ~[app:?]

        at java.lang.Thread.run(Thread.java:1589) ~[?:?]

Caused by: java.lang.IllegalArgumentException: File 'plugins\test.jar' is not a valid plugin file, cannot load a plugin from it!

        at io.papermc.paper.plugin.provider.source.FileProviderSource.registerProviders(FileProviderSource.java:54) ~[paper-1.19.3.jar:git-Paper-448]

        ... 20 more

로그 맨 위에 이 문구가 뜨면서 적용이 안되는데 무엇때문인가요..? 얼핏 봐선 페이퍼 Git..? 때문에 그런거 같은데 플긴 입문자라 잘 모르겠습니다 ㅠㅠ