java.lang.ClassFormatError: QTextButtonComponent (Bad magic number)

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java.lang.ClassFormatError: QTextButtonComponent (Bad magic number)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:512)
at java.lang.ClassLoader.defineClass(ClassLoader.java:441)
at qub.io.QClassReader$QubClassLoader.findClass(QClassReader.java:75)
at java.lang.ClassLoader.loadClass(ClassLoader.java:309)
at java.lang.ClassLoader.loadClass(ClassLoader.java:265)
at qub.io.QClassReader.readClass(QClassReader.java:49)
at qub.io.QPluginCreator.createPlugin(QPluginCreator.java:142)
at qub.io.QPluginListReader.internalMakeCall(QPluginListReader.java:107)
at qub.io.QPluginListReader.readPlugins(QPluginListReader.java:69)
at qub.io.QPluginListReader.main(QPluginListReader.java:172)

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