Unhandled exception. System.Exception: col7 column not found. Make sure the name searched for matches the name in the schema.

[pjsgsy]

Win11
ML.net is the latest stable release from nuget
.net 6.0 console app

Describe the bug
Using the generated code from a simple tabular scenario with 1 label column with 3 possible values results in an exception.

This is the exact code offered by the model maker

"//Load sample data
var sampleData = new MLModel1.ModelInput()
{
Col0 = -1.833333F,
Col1 = -0.9662699F,
Col2 = -0.8599034F,
Col3 = -0.2951389F,
Col4 = 4.972222F,
Col5 = -0.422619F,
Col6 = -0.1358025F,
};

//Load model and predict output
var result = MLModel1.Predict(sampleData);
"
Even the plain sample project generated will not run and causing this exception.

Asking for a prediction will cause the exception, and it always complains that the label column is missing, which does not make sense to me. I have also replicated this in a completely new project, from scratch. The source data feed consists of the 7 data columns, and the label column.

The exception will always be
Unhandled exception. System.Exception: col7 column not found. Make sure the name searched for matches the name in the schema.

Not sure what is happening here as I have done this in the past without issue (though at least a few months back!)

[michaelgsharp]

Can you share the full sample code? Without seeing the rest its hard to know what is going on. Seems to want a Col7 which you don't provide in your input, but without seeing the pipeline we have know way of knowing what wants that col and where it is supposed to be coming from.

[pjsgsy]

Hi - Thanks for your response. Sorry - Should have updated this. Posted the same query in the Discord. It turns out to be a bug with the version of the Model builder I had. Grabbing the latest build manually from the site (VS Update did not detect a new release) and manually installing it resolved the issue.