dotnet / dotnet/machinelearning-modelbuilder
Value cannot be null. (Parameter 'providerFactory') Visual studio 2026
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Description
I'm trying to follow this tutorial : https://learn.microsoft.com/en-us/dotnet/machine-learning/tutorials/health-violation-classification-model-builder
but when i tried to start training, i get the a error.
error msg: ```
at Microsoft.ML.Runtime.Contracts.CheckValue[T](T val, String paramName)
at Microsoft.ML.Data.DatabaseSource..ctor(DbProviderFactory providerFactory, String connectionString, String commandText, Int32 commandTimeoutInSeconds)
at Microsoft.ML.Data.DatabaseSource..ctor(DbProviderFactory providerFactory, String connectionString, String commandText)
at Microsoft.ML.ModelBuilder.AutoMLEngine.StartTrainingAsync(ITrainingConfiguration config, PathConfiguration pathConfig, CancellationToken userCancellationToken) in /_/src/Microsoft.ML.ModelBuilder.AutoMLService/AutoMLEngineService/AutoMLEngine.cs:line 115
```
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