2017-08-04 JupyterLabで「The 'kernel_spec_manager_class' trait of <jupyterlab.labapp.LabApp object at 0x7fa28680fe10> instance must be a type, but 'environment_kernels.EnvironmentKernelSpecManager' could not be imported」エラー AI pip install environment-kernels を実行したら直った。 参考: qiita.com