When i create a new kotlin app (blank app), after gradle run, the all code default is covered with red line.
My gradle project: 
My gradle module: 
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Huy Loc Vu
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Close the project and reopen it – tyczj Sep 22 '21 at 16:41
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Is the Android SDK properly installed on your machine? – Egor Sep 22 '21 at 16:43
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what about manifest? are there any errors in that? – lets start coding Sep 22 '21 at 16:56
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yes, i close and reopen but it still error. – Huy Loc Vu Sep 23 '21 at 00:49
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before you give an effort to create a question, I suggest you to type your problem on google. I found this [Link](https://stackoverflow.com/q/65496655/11021522) that might be same as your problem. – Muhammad Farras Ma'ruf Sep 23 '21 at 00:58
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Please clarify your specific problem or provide additional details to highlight exactly what you need. As it's currently written, it's hard to tell exactly what you're asking. – Community Sep 29 '21 at 20:56