Error in tdc_developability.ipynb notebook

[velocirraptor23]

I was trying to follow this notebook but in the part for training (Creating Datasets) I got this error:

File /cluster/ddu/cmmartinez001/graphein/notebooks/../graphein/ml/conversion.py:274, in GraphFormatConvertor.convert_nx_to_pyg(self, G)
264 """
265 Converts NetworkX graph to pytorch_geometric.data.Data object. Requires PyTorch Geometric (https://pytorch-geometric.readthedocs.io/en/latest/) to be installed.
266
(...)
270 :rtype: pytorch_geometric.data.Data
271 """
273 # Initialise dict used to construct Data object & Assign node ids as a feature
--> 274 data = {"node_id": list(G.nodes())}
275 G = nx.convert_node_labels_to_integers(G)
277 # Construct Edge Index

AttributeError: 'NoneType' object has no attribute 'nodes'

I think I instaled everything but I am not sure why i got this.

BW,

Cesar