Ipython Exceptions

[NotebookApp] Kernel shutdown: 848445b9-a0f8-45cc-af6e-007d324358d4 Unhandled exception in thread started by <bound method ParentPollerUnix.__bootstrap of <ParentPollerUnix(Thread-1, stopped daemon 140273722664704)>> Error in sys.excepthook: Traceback (most recent call last): File "/usr/local/lib/python2.7/dist-packages/IPython/core/ultratb.py", line 1028, in call self.handler((etype, evalue, etb)) File "/usr/local/lib/python2.7/dist-packages/IPython/core/ultratb.py", line 1017, in handler ostream.write(self.text(etype, evalue, etb)) File "/usr/local/lib/python2.7/dist-packages/IPython/core/ultratb.py", line 412, in text tb_offset, context) File "/usr/local/lib/python2.7/dist-packages/IPython/core/ultratb.py", line 1078, in structured_traceback return VerboseTB.structured_traceback( AttributeError: 'NoneType' object has no attribute 'structured_traceback'

Original exception was: Traceback (most recent call last): File "/usr/lib/python2.7/threading.py", line 524, in __bootstrap self.__bootstrap_inner() File "/usr/lib/python2.7/threading.py", line 564, in __bootstrap_inner (self.name, _format_exc())) File "/usr/lib/python2.7/traceback.py", line 240, in format_exc etype, value, tb = sys.exc_info() AttributeError: 'NoneType' object has no attribute 'exc_info' [NotebookApp] Kernel shutdown: deb00066-b427-4419-ada6-ff9a332eff61