while Fit() its showing the error, using the below code. estimator.Fit(splitTrainSet); --- #### Document Details ⚠ *Do not edit this section. It is required for docs.microsoft.com ➟ GitHub issue linking.* * ID: c8e22825-c4ee-5a36-f911-8ad456970ecc * Version Independent ID: ad0bf640-7dfc-1184-077c-358bb14277a7 * Content: [Tutorial: Analyze website comments - binary classification - ML.NET](https://docs.microsoft.com/en-us/dotnet/machine-learning/tutorials/sentiment-analysis#feedback) * Content Source: [docs/machine-learning/tutorials/sentiment-analysis.md](https://github.com/dotnet/docs/blob/master/docs/machine-learning/tutorials/sentiment-analysis.md) * Product: **dotnet-ml** * GitHub Login: @JRAlexander * Microsoft Alias: **johalex**