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问题:

I've build a react-native application and suddenly I get this error message on my terminal during run of the command react-native run-ios. The same code work fine 10 minutes ago and suddenly I get this error message. Please help...

回答1:

SOLVED: Always be sure to update your Xcode folks!

Protip: And don't do it from the apple store (but always do it from an official apple website of course)

tip from: http://ericasadun.com/2016/03/22/xcode-upgrades-lessons-learned/

official apple download page: https://developer.apple.com/download/more/

For those who are unable to resolve with above method

Go to project settings in Xcode. Menu File->Project Settings
Go to per-User Project Settings section.
Click on advanced.
Select Xcode Default option. previously this used to be Legacy for my project.

I have analysed on similar lines and concluded that clean is causing the archive to fail. So, the new build system is not clearing the custom/legacy build directory.

delete the build/ folder in ios/ and rerun if that doesn't do any change then
File -> Project Settings (or WorkSpace Settings) -> Build System -> Legacy Build System
Rerun and voilà!

If it still Fails you need to clean full project

Do the following:

Delete ios dir manually
Clean cache Run npm cache clean --force
Run react-native eject
Re-install all packages npm install
Run the link command react-native link
Finally run react-native run-ios

回答2:

delete the build/ folder in ios/ and rerun if that doesn't do any change then
File -> Project Settings (or WorkSpace Settings) -> Build System -> Legacy Build System
Rerun and voilà!

In case this doesn't work, don't be sad, there is another solution to deeply clean project

Delete ios/ and android/ folders.
Run react-native eject
Run react-native link
react-native run-ios

This will bring a whole new resurrection for your project

回答3:

If you don't have cocoa pods installed you need to sudo gem install cocoapods

run cd ios
run pod install
cd ..
delete build folder
run react-native run-ios

if error persists, 1. delete build folder again 2. open the /ios folder in x-code 3. navigate File -> Project Settings -> Build System -> change (Shared workspace settings and Per-User workspace settings): Build System -> Legacy Build System

回答4:

I had the same error, but it was caused by the package manager process port being already used (port 8081).

To fix, I just ran the react-native by specifying a different port, see below.

react-native run-ios --port 8090

回答5:

If you don't have cocoa pods installed you need to:

sudo gem install cocoapods

Then run:

cd /ios
pod install

delete the build folder in ios folder of your react native project

run:

react-native run-ios

if error persists:

delete build folder again
open the /ios folder in Xcode
navigate File -> Project Settings -> Build System -> change (Shared workspace settings and Per-User workspace settings): Build System -> Legacy Build System