NNI is starting, it's time to run an epoch but there's no value in the page?

Describe the issue:

it's time to run an epoch but there's no value in the page?

Environment:

NNI version:2.5
Training service (local|remote|pai|aml|etc):local
Client OS:Win10
Server OS (for remote mode only):
Python version: 3.7
PyTorch/TensorFlow version:PyTorch
Is conda/virtualenv/venv used?:conda
Is running in Docker?: no

Configuration: searchSpaceFile: search_space.json trialCommand: python train_nni.py trialGpuNumber: 0 trialConcurrency: 1 tuner: name: TPE classArgs: optimize_mode: maximize trainingService: platform: local

How to reproduce it?:

microsoft / nni

NNI is starting, it's time to run an epoch but there's no value in the page? #5720