Ant not working...please make it run

[manglesh jain]

I am getting this error.I have set all the environment variable needed to run ant. actually it was running at 6PM but when i run ant again around at 6:15 it showed me this error....what actually i mean is that it suddenly gave me this error..what might be the problem.I am not getting this why it is working like this.Following is the message i am getting........

D:\continuus\ccm_wa\mso\TWC-pasija_TWC_1.0_1\TWC>ant clean

Exception in thread "main" java.lang.NoSuchMethodError: sun.misc.Resource.getCodeSourceURL()Ljava/net/URL;
at java.net.URLClassLoader.defineClass(URLClassLoader.java:214)
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)