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Xcode – Lexical or Preprocessor Issue – event2/event-config.h file not found

I have a cleanly installed Mac 10.15.7, with freshly installed xCode (12.4) on in it. I installed react-native following the official instructions here. I created a new project and tried to build it (from Xcode), but ended up with this error:

Lexical or Preprocessor Issue – event2/event-config.h file not found

Error Message

It appears to have something to do with Flipper. I have absolutely no clue how to fix this, as I am not familiar with CPP development and the file/data-structure it needs…

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3

Answers


  1. 0

    That’s because there is a new version of Flipper and React Native might not come with the right one so best is to go in your podfile and add this use_flipper!({ 'Flipper' => '0.74.0' }) then run pod install

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  2. 0

    SOLVED:

    First i tried to add use_flipper!({ 'Flipper' => '0.74.0' }) But it didnt solve my error then i commented out this like like # use_flipper!({ 'Flipper' => '0.74.0' }) and run pod install it started working.

    Honestly don’t know how 🙂

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  3. 0

    You need to get the latest version of Flipper SDK, from here: https://fbflipper.com/docs/getting-started/react-native/

    For example: use_flipper!({ 'Flipper' => '0.78.0' }) then run pod install in the ios directory.

    This fixed it for me.

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