Using latest dev builc, all plugins have this error:

Caused by: java.lang.IllegalStateException: zip file closed
at java.util.zip.ZipFile.ensureOpen(ZipFile.java:669) ~[?:1.8.0_72]
at java.util.zip.ZipFile.getEntry(ZipFile.java:309) ~[?:1.8.0_72]
at java.util.jar.JarFile.getEntry(JarFile.java:240) ~[?:1.8.0_72]
at java.util.jar.JarFile.getJarEntry(JarFile.java:223) ~[?:1.8.0_72]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:120) ~[patched_1.12.2.jar:git-Paper-1500]
at org.bukkit.plugin.java.JavaPluginLoader.getClassByName(JavaPluginLoader.java:189) ~[patched_1.12.2.jar:git-Paper-1500]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:115) ~[patched_1.12.2.jar:git-Paper-1500]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:104) ~[patched_1.12.2.jar:git-Paper-1500]
at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_72]
at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_72]

Could you please provide me with the complete server log.

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Please try if this build resolves the issue for you: https://ci.pcgamingfreaks.at/job/MarriageMaster%20V2/39/artifact/target/MarriageMaster-2.0-RC2-SNAPSHOT.jar

Fantastic, thanks. :D