I tried to run the code
pcp.get_compounds('CC', searchtype='superstructure', listkey_count=3)
but, it didn't work.
This code is exactly the same as one shown in the documentation ("https://pubchempy.readthedocs.io/en/latest/guide/searching.html#advanced-search-types").
Another code such as pcp.get_compounds('Aspirin', 'name', record_type='3d')
which is shown in the same page worked.
Please give me some advice about how to fix this error.