请问一下，这个什么意思

F:\Git\LeNet-5>python run.py
Train - Epoch 1, Batch: 0, Loss: 2.312821
Traceback (most recent call last):
File "run.py", line 93, in
main()
File "run.py", line 89, in main
train_and_test(e)
File "run.py", line 83, in train_and_test
train(epoch)
File "run.py", line 58, in train
if viz.check_connection():
AttributeError: 'Visdom' object has no attribute 'check_connection'