ImportError: No module named 'pandas.core.internals.managers'; 'pandas.core.internals' is not a package
conda update pandas
If you use conda package manager.
When I tried to read a pickle file that saved by a former version of pandas, it yielded an ImportError.

ImportError: No module named 'pandas.core.internals.managers';
  'pandas.core.internals' is not a package

There was no hit on stackoverflow so i would like to share my solution for this particular problem.