TypeError: tuple indices must be integers or slices, not str

[Vanleya]

Traceback (most recent call last):
File "scripts/inference.py", line 100, in
run()
File "scripts/inference.py", line 39, in run
net = HyperInverter(opts)
File "./models/hyper_inverter.py", line 58, in init
self.load_weights()
File "./models/hyper_inverter.py", line 102, in load_weights
G_original = ckpt["G_ema"]
TypeError: tuple indices must be integers or slices, not str

I don't understand why I have this problem?

[Vanleya]

solved，use official stylegan2 model