Not able to import traceback or sys module

Installations & Python Packages
1

I am getting following error in the code 

 object of type 'numpy.float64' has no len()

I have no idea wwhich line this is referring to as i am not using len() anywhere explicitly.
To debug this i was planning to use traceback module but i get the error that this module is not part of the whitelist.
Why is that so ? And any work around which can help me point to the line where i am getting this error.
2

On Blueshift, you can import and use only the whitelisted packages. This is for security purposes. Neither traceback or sys is part of the whitelisted packages.



The error you got means that a numpy variable that you think is an array is actually a scalar. We have some issues on the platform for displaying error messages for quick backtest. I suggest you run a full backtest and you should be able to trace the error from the error logs. If not, please feel free to write to blueshift-support.