java.lang.SecurityException: Invalid signature file digest for Manifest main attributes

at sun.security.util.SignatureFileVerifier.processImpl(SignatureFileVerifier.java:221)

at sun.security.util.SignatureFileVerifier.process(SignatureFileVerifier.java:176)

at java.util.jar.JarVerifier.processEntry(JarVerifier.java:234)

at java.util.jar.JarVerifier.update(JarVerifier.java:188)

at java.util.jar.JarFile.initializeVerifier(JarFile.java:321)

at java.util.jar.JarFile.getInputStream(JarFile.java:386)

at sun.misc.URLClassPath$JarLoader$2.getInputStream(URLClassPath.java:689)

at sun.misc.Resource.cachedInputStream(Resource.java:59)

at sun.misc.Resource.getByteBuffer(Resource.java:154)

at java.net.URLClassLoader.defineClass(URLClassLoader.java:249)

at java.net.URLClassLoader.access$000(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:307)

at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)

at java.lang.ClassLoader.loadClass(ClassLoader.java:252)

at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)

Could not find the main class: processing.core.PApplet.  Program will exit.

Exception in thread "main" 

 

i don't understand why didn't find the processing.core .Papplet . I ve hadn't this problem before. I always used the processing OPenGL library without problem. i've tried to uninstall java on my pc but isn't the problem.who can help me please?

thanks in advance