Error, failed to start plugin. Reason: Jar does not contain plugin.yml

I've found this error, please solve it:
[19:06:50 ERROR]: Could not load 'plugins\MythicMobs-Quests-2.4.jar' in folder 'plugins'
org.bukkit.plugin.InvalidDescriptionException: Invalid plugin.yml
at org.bukkit.plugin.java.JavaPluginLoader.getPluginDescription(JavaPluginLoader.java:154) ~[spigot.jar:git-Spigot-3ccadba-fb568fd]
at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:133) [spigot.jar:git-Spigot-3ccadba-fb568fd]
at...

Error, failed to start plugin. Reason: Jar does not contain plugin.yml