How can I resolve these errors?

Hi, I’m new here and I have been getting this error code. How do I resolve them?

Have you tried something like:

Also: “Pin ~” looks suspicious. usually pins have numbers (although a pin number can be any text string in KiCad.

What sort of component is U2?
Also if you click on the blue text, KiCad pans to the locations it thinks the problem is, which gives more hints.

My best guess is there may be some problem with the “U2” symbol, what sort of component is it? Is it from KiCad’s lib’s or did you make it yourself?

These might help:

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