How do u code a validation error for my Survey page?

Hello, I am in desperate need of help. I cannot figure out how to get a validation error in my survey and I need that to finish the task. Also for whatever reason there are some 3 tasks that I can not get right no matter how much I rearrange me code. Please help me.My Survey Page

You haven’t set id for some of your inputs, namely name, email and number

click on the number of passed tests to see which tests you are failing, and below the failed tests there is an error message with more infos

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Thank you, I finally realised what I was doing wrong