Many of you, like us, may continue to encounter numerous errors while using the app. 

One of the most frequently asked errors, for example, is “An error was encountered processing the command (domain=com.apple.CoreSimulator.SimError, code=405) in React-native“. So, how can this be resolved? We will discuss together to figure out the best solutions for you.

Error message

You are trying to build in your react-native project but are facing the following error.

success Successfully built the app

--- xcodebuild: WARNING: Using the first of multiple matching destinations:

info Installing "/Users/milanpatel/Library/Developer/Xcode/DerivedData/myracnative-glxuojrfejxbhqgircpjgklctbto/Build/Products/Debug-iphonesimulator/myracnative.app"

An error was encountered processing the command (domain=com.apple.CoreSimulator.SimError, code=405):

Unable to lookup in current state: Shutdown

How to fix error “An error was encountered processing the command (domain=com.apple.CoreSimulator.SimError, code=405)”?

This error usually occurs due to the difference between versions. Here are some solutions you can refer to and choose the one that’s suitable for you.

Solution 1: Run react-native run-ios 

The easy way is quit the Simulator, after that, run command react-native run-ios again, for example:

npx react-native run-ios --simulator="iPhone 8"

Solution 2: Delete Project Build Data and indexes

This may be a bug in XCode 13’s most recent version. If you believe this is the case, you could submit a bug report to Apple for assistance.

To fix error above, follow these instructions: In your Mac select Storage -> Manage -> Developer -> then Delete Project Build Data and Indexes.

Solution 3: Delete the DerivedData folder

This problem occurred after you updated the Xcode to version 13.0, and Xcode caches caused it. To resolve this, delete the DerivedData folder.

To resolve the above error, try the following steps:

Select Preferences > Locations in Xcode. After that, choose Relative in Derived Data, like the following picture:

Conclusion

If you’re stuck on the error “An error was encountered processing the command (domain=com.apple.CoreSimulator.SimError, code=405) in React-native“, the remedies listed above are the fastest way.

People have a growing community where everybody is usually willing to help if you still need advice or have frequent doubts. Finally, we hope you’re having fun with the amazing code options and appreciate spending time reading.