H2ogeneralizedlinearestimator() - Prediction Error

I am trying to predict test times in a Kaggle comp using the H2OGeneralizedLinearEstimator function. The model trains normally in line 3 and the metrics are all reasonable. However

Solution 1:

To summarize the comments above, the current solution is to add a response column (with fake data if it doesn't exist) to the test_data frame. However, this is a bug that should be fixed. The JIRA is here.