关于“Using the BigQuery ML Hyperparameter Tuning to Improve Model Performance”的评价

I could not pass from step 2 because of this error: "Failed to calculate mean since the entries in corresponding column 'airport_fee' are all NULLs". I was going to try to solve the problem, but the platform didn't let me edit the query (I wasn't able of doing nothing except copy the queries).

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