Problem/Bug Plugins won't load...

I keep getting this error:

Code:

[00:16:12] [Server thread/ERROR]: Could not load 'plugins/PlugMan.jar' in folder 'plugins'
org.bukkit.plugin.InvalidDescriptionException: Invalid plugin.yml
    at org.bukkit.plugin.java.JavaPluginLoader.getPluginDescription(JavaPluginLoader.java:160) ~[ElapsedSpigot.jar:git-TacoSpigot-unknown]
    at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:125) [ElapsedSpigot.jar:git-TacoSpigot-unknown]
    at org.bukkit.craftbukkit.v1_8_R3.CraftServer.loadPlugins(CraftServer.java:297) [ElapsedSpigot.jar:git-TacoSpigot-unknown]
    at net.minecraft.server.v1_8_R3.DedicatedServer.init(DedicatedServer.java:208) [ElapsedSpigot.jar:git-TacoSpigot-unknown]
    at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:581) [ElapsedSpigot.jar:git-TacoSpigot-unknown]
    at java.lang.Thread.run(Thread.java:748) [?:1.8.0_222]
Caused by: java.util.zip.ZipException: invalid CEN header (bad signature)
    at java.util.zip.ZipFile.open(Native Method) ~[?:1.8.0_222]
    at java.util.zip.ZipFile.<init>(ZipFile.java:225) ~[?:1.8.0_222]
    at java.util.zip.ZipFile.<init>(ZipFile.java:155) ~[?:1.8.0_222]
    at java.util.jar.JarFile.<init>(JarFile.java:166) ~[?:1.8.0_222]
    at java.util.jar.JarFile.<init>(JarFile.java:130) ~[?:1.8.0_222]
    at org.bukkit.plugin.java.JavaPluginLoader.getPluginDescription(JavaPluginLoader.java:148) ~[ElapsedSpigot.jar:git-TacoSpigot-unknown]
    ... 5 more
[00:16:12] [Server thread/ERROR]: Could not load 'plugins/ViaVersion-2.1.3.jar' in folder 'plugins'
org.bukkit.plugin.InvalidDescriptionException: Invalid plugin.yml
    at org.bukkit.plugin.java.JavaPluginLoader.getPluginDescription(JavaPluginLoader.java:160) ~[ElapsedSpigot.jar:git-TacoSpigot-unknown]
    at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:125) [ElapsedSpigot.jar:git-TacoSpigot-unknown]
    at org.bukkit.craftbukkit.v1_8_R3.CraftServer.loadPlugins(CraftServer.java:297) [ElapsedSpigot.jar:git-TacoSpigot-unknown]
    at net.minecraft.server.v1_8_R3.DedicatedServer.init(DedicatedServer.java:208) [ElapsedSpigot.jar:git-TacoSpigot-unknown]
    at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:581) [ElapsedSpigot.jar:git-TacoSpigot-unknown]
    at java.lang.Thread.run(Thread.java:748) [?:1.8.0_222]
Caused by: java.util.zip.ZipException: invalid CEN header (bad signature)
    at java.util.zip.ZipFile.open(Native Method) ~[?:1.8.0_222]
    at java.util.zip.ZipFile.<init>(ZipFile.java:225) ~[?:1.8.0_222]
    at java.util.zip.ZipFile.<init>(ZipFile.java:155) ~[?:1.8.0_222]
    at java.util.jar.JarFile.<init>(JarFile.java:166) ~[?:1.8.0_222]
    at java.util.jar.JarFile.<init>(JarFile.java:130) ~[?:1.8.0_222]
    at org.bukkit.plugin.java.JavaPluginLoader.getPluginDescription(JavaPluginLoader.java:148) ~[ElapsedSpigot.jar:git-TacoSpigot-unknown]
    ... 5 more

Does anyone know why this is happening?