Why I have this problem? I closed activity_main.xml tab and reopen, I restart android studio.
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In the top right corner, there is a red icon click maybe it will help you. – Sajad Hosseini May 07 '21 at 20:57
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@SajadHosseini Open this link [link] (https://imgur.com/gallery/mo3dXXi) – Mohamed Mohamed May 07 '21 at 21:06
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Do you use to contribute to this project and use git? – Sajad Hosseini May 07 '21 at 21:13
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No. this is what i will do, reinstall – Mohamed Mohamed May 07 '21 at 21:18
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Before doing that check [link](https://stackoverflow.com/questions/38737668/gradle-error-string-index-out-of-range-0) – Sajad Hosseini May 07 '21 at 21:20