Hi everyone! 

We have received 2 reports of a strange issue in 5.1.0rc1 in which an error 
dialog reading "Can't make callback from given data" is displayed on 
loading of a notebook. If you have encountered this error, please share 
your observations with us so that we can get to the bottom of it. See #2747 
<https://github.com/jupyter/notebook/issues/2747> for more details.

We have just published notebook 5.1.0rc2 to PyPI 
<https://pypi.python.org/pypi/notebook>. This includes a couple bug fixes 
since rc1. 

To install:

pip install notebook --upgrade --pre --force-reinstall

Please give it a try and if you encounter any issues, please file an issue 
on Github. 

Thanks!

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