PackageNotInstalledError: Package is not installed in prefix
Usually this error, "PackageNotInstalledError: Package is not installed in prefix." is because your custom environment doesn't have the conda infrastructure. Instead, it is in your base only. To update the base environment:
conda update --name base condaTo see what version you have installed:
conda list --name base condaexample output of list;
# packages in environment at /Users/me/miniconda2:## Name Version Build Channelconda 4.6.14 py27_0 conda-env 2.6.0 h36134e3_0
to solve the problem after message "PackageNotInstalledError: Package is not installed in prefix" package name: anaconda:
conda update --all ... Proceed ([y]/n)? yregards !
Just encountered this error. The solution was to run,
conda install anaconda