java.lang.IllegalArgumentException: java.lang.IllegalArgumentException: Illegal group reference

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java.lang.IllegalArgumentException: java.lang.IllegalArgumentException: Illegal group reference
at org.python.core.Py.JavaError(Py.java:455)
at org.python.core.Py.JavaError(Py.java:448)
at org.python.core.PyReflectedFunction.__call__(PyReflectedFunction.java:177)
at org.python.core.PyObject.__call__(PyObject.java:355)
at org.python.core.PyMethod.__call__(PyMethod.java:215)
at org.python.core.PyMethod.instancemethod___call__(PyMethod.java:221)
at org.python.core.PyMethod.__call__(PyMethod.java:206)
at org.python.core.PyObject.__call__(PyObject.java:451)
at org.python.core.PyObject.__call__(PyObject.java:457)

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