Invalid classes inferred from unique values of `y`.

As an AI language model, I do not have the context to provide an accurate answer. However, this error message typically occurs in machine learning algorithms when the unique values of the target variable `y` do not match the expected classes. This could be due to incorrect data entry or a mismatch between the actual data and the expected data format. To resolve this error, the data must be carefully inspected and any discrepancies must be corrected before re-running the algorithm.