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java.lang.ClassFormatError: DateTrial (Illegal constant pool type)	at java.lang.ClassLoader.defineClass0(Native Method)	at java.lang.ClassLoader.defineClass(ClassLoader.java:502)	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)	at java.net.URLClassLoader.defineClass(URLClassLoader.java:250)	at java.net.URLClassLoader.access$100(URLClassLoader.java:54)	at java.net.URLClassLoader$1.run(URLClassLoader.java:193)	at java.security.AccessController.doPrivileged(Native Method)	at java.net.URLClassLoader.findClass(URLClassLoader.java:186)	at java.lang.ClassLoader.loadClass(ClassLoader.java:299)	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:265)	at java.lang.ClassLoader.loadClass(ClassLoader.java:255)	at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:315)