java.lang.IncompatibleClassChangeError: Implementing class

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java.lang.IncompatibleClassChangeError: Implementing class
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at gitbucket.core.plugin.PluginRegistry$.gitbucket$core$plugin$PluginRegistry$$$anonfun$6(PluginRegistory.scala:189)
at gitbucket.core.plugin.PluginRegistry$.gitbucket$core$plugin$PluginRegistry$$$anonfun$6$adapted(PluginRegistory.scala:186)

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