Failed to find newest available simulator runtime - Image.xcassets when building RN app on iOS

Solution 1:

sudo killall -9 com.apple.CoreSimulator.CoreSimulatorService

Solution 2

When upgrading, you may drag around old simulators no longer available with your current version of Xcode. You can clean these by running this command in Terminal:

xcrun simctl delete unavailable

Quit Xcode first just for good measures. From the documentation:

Delete a device or all unavailable devices.

Solution 3:

Installing/Reinstalling Simulators worked!!

Look under (XCode Preferences-> Downloads -> Components)

Solution 4 (Sam Solution)

just delete Xcode and install the newest version from developer.apple.com/download/more .

sudo xcrun simctl shutdown all && sudo xcrun simctl erase all

It helped to fix Jenkins