报错信息：
[00:27:21 ERROR]: Could not load 'plugins\[练习2]MCPluginExp2.jar' in folder 'plugins'
org.bukkit.plugin.InvalidDescriptionException: Invalid plugin.yml
        at org.bukkit.plugin.java.JavaPluginLoader.getPluginDescription(JavaPluginLoader.java:164) ~[spigot-1.10.jar:git-Spigot-6016ac7-7964365]
        at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:133) [spigot-1.10.jar:git-Spigot-6016ac7-7964365]
        at org.bukkit.craftbukkit.v1_10_R1.CraftServer.loadPlugins(CraftServer.java:297) [spigot-1.10.jar:git-Spigot-6016ac7-7964365]
        at net.minecraft.server.v1_10_R1.DedicatedServer.init(DedicatedServer.java:202) [spigot-1.10.jar:git-Spigot-6016ac7-7964365]
        at net.minecraft.server.v1_10_R1.MinecraftServer.run(MinecraftServer.java:539) [spigot-1.10.jar:git-Spigot-6016ac7-7964365]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_211]
Caused by: org.yaml.snakeyaml.error.YAMLException: java.nio.charset.MalformedInputException: Input length = 1
        at org.yaml.snakeyaml.reader.StreamReader.update(StreamReader.java:200) ~[spigot-1.10.jar:git-Spigot-6016ac7-7964365]
        at org.yaml.snakeyaml.reader.StreamReader.<init>(StreamReader.java:60) ~[spigot-1.10.jar:git-Spigot-6016ac7-7964365]
        at org.yaml.snakeyaml.Yaml.load(Yaml.java:381) ~[spigot-1.10.jar:git-Spigot-6016ac7-7964365]
        at org.bukkit.plugin.PluginDescriptionFile.<init>(PluginDescriptionFile.java:232) ~[spigot-1.10.jar:git-Spigot-6016ac7-7964365]
        at org.bukkit.plugin.java.JavaPluginLoader.getPluginDescription(JavaPluginLoader.java:159) ~[spigot-1.10.jar:git-Spigot-6016ac7-7964365]
        ... 5 more
Caused by: java.nio.charset.MalformedInputException: Input length = 1
        at java.nio.charset.CoderResult.throwException(Unknown Source) ~[?:1.8.0_211]
        at sun.nio.cs.StreamDecoder.implRead(Unknown Source) ~[?:1.8.0_211]
        at sun.nio.cs.StreamDecoder.read(Unknown Source) ~[?:1.8.0_211]
        at java.io.InputStreamReader.read(Unknown Source) ~[?:1.8.0_211]
        at org.yaml.snakeyaml.reader.UnicodeReader.read(UnicodeReader.java:123) ~[spigot-1.10.jar:git-Spigot-6016ac7-7964365]
        at java.io.Reader.read(Unknown Source) ~[?:1.8.0_211]
        at org.yaml.snakeyaml.reader.StreamReader.update(StreamReader.java:184) ~[spigot-1.10.jar:git-Spigot-6016ac7-7964365]
        at org.yaml.snakeyaml.reader.StreamReader.<init>(StreamReader.java:60) ~[spigot-1.10.jar:git-Spigot-6016ac7-7964365]
        at org.yaml.snakeyaml.Yaml.load(Yaml.java:381) ~[spigot-1.10.jar:git-Spigot-6016ac7-7964365]
        at org.bukkit.plugin.PluginDescriptionFile.<init>(PluginDescriptionFile.java:232) ~[spigot-1.10.jar:git-Spigot-6016ac7-7964365]
        at org.bukkit.plugin.java.JavaPluginLoader.getPluginDescription(JavaPluginLoader.java:159) ~[spigot-1.10.jar:git-Spigot-6016ac7-7964365]
        ... 5 more
               



出现错误的plugin.yml的内容：（commands一删掉就正常了，可以锁定是commands部分出问题）



name: Project2
main: com.bc.exp2.Project2
version: 2.0
author: bc
commands:
        demo:
                description: "测试指令"
                usage: /demo
                aliases: [d,de]



服务器版本：spigot 1.10 v1.2



已安装插件：
ProtocolLib

GroupManagerX-2.2-SNAPSHOT

EssentialsX-2.0.1

commands前面要加@
就是这样
@commands
然后注意空格

你空格空的太多了