error stack when I try to execute my code

[paty]

this error appears when I try to execute my code called IllegalStateException, here is the error stack,

java.lang.IllegalStateException: 
	at java.util.zip.ZipFile.getEntryImpl(Native Method)
	at java.util.zip.ZipFile.getEntry(ZipFile.java:182)
	at java.util.jar.JarFile.getEntry(JarFile.java:250)
	at java.util.jar.JarFile.getJarEntry(JarFile.java:109)
	at java.net.URLClassLoader.findClassImpl(URLClassLoader.java:508)
	at java.net.URLClassLoader$4.run(URLClassLoader.java:632)
	at java.security.AccessController.doPrivileged(AccessController.java:102)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:125)
	com.ibm.osg.smf.BundleClassLoader.loadClass(BundleClassLoader.java:337)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:541)

[hardwired]

at java.util.zip.ZipFile.getEntry
Looking up the getEntry method in the ZipFile class, in the Method Detail section, it says that an IllegalStateException is thrown if the zip file has been closed.