Traceback (innermost last):
  File "D:\l2j-server\gameserver\data\jscript\blacksmith\1010_exchange\__init__.
py", line 288, in onEvent
TypeError: __add__ nor __radd__ defined for these operands

        at org.python.core.Py.TypeError(Py.java:123)
        at org.python.core.PyObject._add(PyObject.java:1898)
        at data.jscript.blacksmith.1010_exchange$py.onEvent$5(D:\l2j-server\game
server\data\jscript\blacksmith\1010_exchange\__init__.py:288)
        at data.jscript.blacksmith.1010_exchange$py.call_function(D:\l2j-server\
gameserver\data\jscript\blacksmith\1010_exchange\__init__.py)
        at org.python.core.PyTableCode.call(PyTableCode.java:213)
        at org.python.core.PyTableCode.call(PyTableCode.java:426)
        at org.python.core.PyTableCode.call(PyTableCode.java:322)
        at org.python.core.PyFunction.__call__(PyFunction.java:193)
        at org.python.core.PyMethod.__call__(PyMethod.java:93)
        at org.python.core.PyObject.__call__(PyObject.java:570)
        at org.python.core.PyObject._jcallexc(PyObject.java:2573)
        at org.python.core.PyObject._jcall(PyObject.java:2605)
        at org.python.proxies.data.jscript.blacksmith.1010_exchange$Quest$194.on
Event(Unknown Source)
        at net.sf.l2j.gameserver.model.quest.Quest.notifyEvent(Quest.java:175)
        at net.sf.l2j.gameserver.model.actor.instance.L2PcInstance.processQuestE
vent(L2PcInstance.java:1148)
        at net.sf.l2j.gameserver.clientpackets.RequestBypassToServer.runImpl(Req
uestBypassToServer.java:149)
        at net.sf.l2j.gameserver.clientpackets.ClientBasePacket.run(ClientBasePa
cket.java:57)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source
)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
        at java.lang.Thread.run(Unknown Source)