Colab error in chapter 1 page45

When I run the following code from lesson/chapter 1 I get the following error in Colab:
dls = TabularDataLoaders.from_csv(path/‘adult.csv’, path=path, y_names=“salary”,
cat_names = [‘workclass’, ‘education’, ‘marital-status’, ‘occupation’, ‘relationship’, ‘race’],
cont_names = [‘age’, ‘fnlwgt’, ‘education-num’],
procs = [Categorify, FillMissing, Normalize])

AttributeError: ‘str’ object has no attribute ‘shape’.

I am just showing this line but all four lines of the code block have been run.