Error Running React Native App From Terminal iOS

Question

I am following the tutorial on the official React Native website   Using the following to build my project   react-native run-ios   I get the error   Found Xcode project TestProject xcodeproj xcrun  error  unable to find utility  instruments   not a developer    tool or in PATH  Command failed  xcrun instruments -s xcrun  error  unable to find utility  instruments   not a developer  tool or in PATH   Although  when I run the app from the  xcodeproj  everything works fine   Any suggestions

User · Answer

For any such problem    Go to  expo folder Find apk-cache Remove that folder    and you are done    Hope it helps

User · Answer

None of these solutions worked for me  These two similar problems offer temporary solutions that worked  it  seems the simulator process isn t being shutdown correctly   Killing Simulator Processes  From https   stackoverflow com a 52533391 11279823   Quit the simulator  amp  Xcode  Opened Activity monitor  selected cpu option and search for sim  killing all the process shown as result  Then fired up the terminal and run sudo xcrun simctl erase all  It will delete all content of all simulators  By content if you logged in somewhere password will be gone  all developer apps installed in that simulator will be gone    Opening Simulator before starting the package  From https   stackoverflow com a 55374768 11279823  open -a Simulator  npm start  Hopefully a permanent solution is found

User · Answer

By default  after installing Xcode command-line not selected  so open Xcode and go to Preferences    Locations and set Command Line Tools     This worked for me in MAC High Sierra  Xcode Version 9 3     Press i to open iOS emulator       And You can see a cool new iPhone simulator like below image

User · Answer

In my case the problem was that Xcode was not installed

User · Answer

Problem is your Xcode version is not set on Command Line Tools  to solve this problem open Xcode Menu preferences  location  here for Command Line tools select your Xcode version  that s it

User · Answer

For those like me who come to this page with this problem after updating Xcode but don t have an issue with the location setting  restarting my computer did the trick

User · Answer

Check out this link  Running react-native run-ios occurs an error    It appears to be a problem with the location of Command line tools   In Xcode  select Xcode menu  then Preferences  then Locations tab  Select your Xcode version from the dropdown and exit Xcode

User · Answer

I had to accept the XCode license after my first install before I could run it  You can run the following to get the license prompt via command line  You have to type agree and confirm as well   sudo xcodebuild -license

User · Answer

You may need to install or set the location of the Xcode Command Line Tools   Via command line  If you have Xcode downloaded you can run the following to set the path   sudo xcode-select -s  Applications Xcode app   If the command line tools haven t been installed yet  you may need to run this first   xcode-select --install   You may need to accept the Xcode license before installing command line tools   sudo xcodebuild -license accept      Via Xcode  Or adjust the Command Line Tools setting via Xcode  Xcode  gt  Preferences  gt  Locations

User · Answer

For me  it turns out that there was an iOS system update pending asking to restart the computer  Restart and let the update finish solved my problem

User · Answer

In Mac  After all  you are getting this issue  there may be a chance of missing the following in System Preferences -  Network -  Ethernet -  Select Advanced -  Proxies  add the following line     local localhost

User · Answer

1  Go to Xcode Preferences  2  Locate the location tab   3  Set the Xcode verdion in Given Command Line Tools  Now  it ll successfully work

User · Answer

In my case the SDKROOT environment variable was wrong  which referred to an old version of iPhoneOSxx x sdk   Perhaps this would have automatically resolved itself after a reboot    You can check by running echo  SDKROOT and verifying that it s a valid path   I fixed it by updating in  bash profile   export SDKROOT  Applications Xcode app Contents Developer Platforms iPhoneOS platform Developer SDKs iPhoneOS11 2 sdk

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