PFB my screenshot
1. Screenshot 1 - Created App builder
2. Screenshot 2 - Deployed helloWorld also tried different api version 45, 46 & 52
3. Screenshot 3 - . Unable to find the component
4 respostas
The problem is that you haven't deployed My Domain in the org. Orgs that do not have My Domain deployed cannot use custom lightning components.
You'll need to open Setup -> My Domain and follow the steps there.