When is this a problem?
When you receive a yellow exclamation point, that is an error. You may also see warnings. Both errors and warnings need to be corrected. The action or process should show all green checkmarks.
Why is this a problem?
Imports will run, but the errors and warnings will result in missing data.
How to correct:
Always read your errors and warnings and correct them. If you ignore errors or warnings, you run the risk of missing and/or incorrect data. Remember that in many cases, a model is a single source of truth, and mistakes with data will cause users to distrust the model.
Questions on this topic? See Do any of the actions result in errors when they are run? in our Model Optimization Checklist forum.