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While you did share your workflow, you didn't include the the Excel file you used so I'm unable to run and replicate the error you're seeing.
One thing that I do see being incorrect is that in both your forecast tools, it's configured to predict the "RecordID" field which was added a couple tools prior to these. This should be set to the numerical value field to target and create a forecast for.
Not sure if this would be the cause, but if changing it to your correct variable still doesn't solve, please share a data file (generalize if necessary) that we can test with.