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java.lang.IllegalStateException: error in opening zip file	at com.atlassian.plugin.classloader.PluginClassLoader.(PluginClassLoader.java:51)	at com.atlassian.plugin.loaders.ClassLoadingPluginLoader.deployPluginFromUnit(ClassLoadingPluginLoader.java:89)	at com.atlassian.plugin.loaders.ClassLoadingPluginLoader.loadAllPlugins(ClassLoadingPluginLoader.java:64)	at com.atlassian.confluence.plugin.DatabaseClassLoadingPluginLoader.loadAllPlugins(DatabaseClassLoadingPluginLoader.java:67)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:585)