1First check you have blur view in package.json file if not then install new one
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4run=>. yarn add @react-native-community/blur
5=============____________________________________======================
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7There are two main thing which cause this error
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91. you have added the blur view but have not installed the pods
10 run=> cd ios && pod install && cd ..
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122. the 2nd cause is you did pod install but did not rebuild the app
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14========you stop the bundle and =====
15run=> yarn ios (this will rebuild the app)
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17Done
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