Uncaught exception in main:
java.lang.VerifyError: constraint check failed, class: org/python/core/PyInteger, source: org/python/core/stringlib/InternalFormatSpec, target: java/lang/String
        at org.python.core.Py.<clinit>(Py.java:555)
        at org.python.core.PyType.init(PyType.java:499)
        at org.python.core.PyType.createType(PyType.java:1280)
        at org.python.core.PyType.addFromClass(PyType.java:1217)
        at org.python.core.PyType.fromClass(PyType.java:1297)
        at org.python.core.PyObject.<init>(PyObject.java:67)
        at org.python.core.PyBuiltinCallable.<init>(PyBuiltinCallable.java:21)
        at org.python.core.PyBuiltinMethod.<init>(PyBuiltinMethod.java:16)
        at org.python.core.PyBuiltinMethod.<init>(PyBuiltinMethod.java:21)
        at org.python.core.PyType$type___init___exposer.<init>(Unknown Source)
        at org.python.core.PyType$PyExposer.<init>(Unknown Source)
        at org.python.core.PyType.<clinit>(PyType.java)
        at org.python.core.PyObject.<init>(PyObject.java:67)
        at org.python.core.PyBuiltinCallable.<init>(PyBuiltinCallable.java:21)
        at org.python.core.PyBuiltinMethod.<init>(PyBuiltinMethod.java:16)
        at org.python.core.PyBuiltinMethodNarrow.<init>(PyBuiltinMethodNarrow.java:24)
        at org.python.core.PyDataDescr$getset_descriptor___get___exposer.<init>(Unknown Source)
        at org.python.core.PyDataDescr$PyExposer.<init>(Unknown Source)
        at org.python.core.PyDataDescr.<clinit>(PyDataDescr.java)
        at org.python.core.PyBuiltinCallable$PyExposer.<init>(Unknown Source)
        at org.python.core.PyBuiltinCallable.<clinit>(PyBuiltinCallable.java)
        at org.python.core.PyObject$PyExposer.<init>(Unknown Source)
        at org.python.core.PyObject.<clinit>(PyObject.java)
        at org.python.util.jython.run(jython.java:159)
        at org.python.util.jython.main(jython.java:135)