URLClassLoader.defineClass() has thrown an IOException

We found this prefix in 2 webpages.
MapChildren (2)Typical messages (2)TraceDetailed Map
  1. java.io.IOException
    1.   at java.util.jar.Attributes.read()
    2.   at java.util.jar.Manifest.read()
    3.   at java.util.jar.Manifest.<init>()
    4.   at java.util.jar.JarFile.getManifestFromReference()
    5.   at java.util.jar.JarFile.getManifest()
    6.   at sun.misc.URLClassPath$JarLoader$2.getManifest()
    7.   at java.net.URLClassLoader.defineClass()
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    Last:1 year ago
    Author:Jamezrin
MessageNumber of crashes
javax/servlet/jsp/JspFactory1
Cannot find main class `me.jaime29010.combatactionbar.Main'1
  1. java.io.IOException
    1.   at java.util.jar.Attributes.read()
    2.   at java.util.jar.Manifest.read()
    3.   at java.util.jar.Manifest.<init>()
    4.   at java.util.jar.JarFile.getManifestFromReference()
    5.   at java.util.jar.JarFile.getManifest()
    6.   at sun.misc.URLClassPath$JarLoader$2.getManifest()
    7.   at java.net.URLClassLoader.defineClass()