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This error message typically occurs when the imputer is trying to convert a non-numeric value to a float value.

To resolve this, you should ensure that all the values in your dataset are of numeric type. You should also check if there are any missing or null values in your dataset, and handle them appropriately (e.g. impute them using the mean or median value of the feature).

If you cannot resolve the issue, you can try using a different imputation method or preprocessing technique. You may also consider removing the problematic feature from your dataset if it is not critical to your analysis.