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When i want run react-native run-android command i see

FAILURE: Build failed with an exception.

BUILD FAILED

Total time: 26.854 secs Could not install the app on the device, read the error above for details. Make sure you have an Android emulator running or a device connected and have set up your Android development environment: https://facebook.github.io/react-native/docs/getting-started.html

I use genymotion .

thank you ...

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  • Try using a proxy/vpn. If you're in a blocked country like Iran, then you can't build without using one. Commented Dec 10, 2018 at 18:03

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RN is trying to download a new version of gradle and get error code 443. This error is related to misconfigured system files in your windows operating system. It's not related to react native and you can search about fix this error in your system. as an experience, you have to use hotspot shield or strong vpn to download from jcenter in iran!

this link may help you: http://www.wiki-errors.com/err.php?wiki=443

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