The error in Machine Learning says that a 1D array was received instead of the expected 2D array.

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This error message typically occurs when a function or method in a Machine Learning library or framework expects a two-dimensional array as input, but receives only a one-dimensional array.

For example, if you try to fit a linear regression model to a single feature, you may get this error because scikit-learn's LinearRegression class requires a two-dimensional array for the feature input.

To resolve this error, you can reshape the data using NumPy's reshape method or use functions like numpy.expand_dims to convert the one-dimensional array to a two-dimensional array. Additionally, you should check the documentation for the function or method you are using to ensure that you are providing the correct input format.