java.lang.NullPointerException: This exception has no message.

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This exception has no message.
java.lang.NullPointerException:
at java.io.File.(File.java:222)
at java.lang.Package$1.run(Package.java:527)
at java.lang.Package.defineSystemPackage(Package.java:520)
at java.lang.Package.getSystemPackages(Package.java:511)
at java.lang.ClassLoader.getPackages(ClassLoader.java:1513)
at java.lang.ClassLoader.getPackages(ClassLoader.java:1511)
at java.lang.Package.getPackages(Package.java:281)
at org.python.core.JavaImportHelper.buildLoadedPackages(Unknown Source)
at org.python.core.JavaImportHelper.tryAddPackage(Unknown Source)
at org.python.core.imp.import_next(Unknown Source)
at org.python.core.imp.import_name(Unknown Source)
at org.python.core.imp.importName(Unknown Source)
at org.python.core.ImportFunction.load(Unknown Source)
at org.python.core.ImportFunction.__call__(Unknown Source)
at org.python.core.PyObject.__call__(Unknown Source)
at org.python.core.__builtin__.__import__(Unknown Source)
at org.python.core.imp.importOne(Unknown Source)

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