java.lang.ClassFormatError: weblogic/iiop/MuxableSocketIIOP (Illegal UTF8 string in constant pool)

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weblogic/iiop/MuxableSocketIIOP (Illegal UTF8 string in constant pool)
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java.lang.ClassFormatError: weblogic/iiop/MuxableSocketIIOP (Illegal UTF8 string in constant pool)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:486)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:111)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:248)
at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:297)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:286)
at java.lang.ClassLoader.loadClass(ClassLoader.java:253)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:313)
at weblogic.t3.srvr.T3Srvr.setJVMID(T3Srvr.java:320)
at weblogic.t3.srvr.T3Srvr.initialize(T3Srvr.java:360)
at weblogic.t3.srvr.T3Srvr.run(T3Srvr.java:197)
at weblogic.Server.main(Server.java:35)

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