Issue
I get the following error on Emulators (tested Genymotion and google Stock Emulator) and on a physical device (Samsung S4) after running react-native run-android
:
The error typed out:
java.util.concurrent.ExcecutionException: java.lang.RuntimeException: SyntaxError: Attempted to redefine property 'key'. (http://192.168.50.37:8081/index.android.bundle?platform=android&dev=true&hot=false:72450)
- In this stackoverflow discussion a similar error (also an
java.util.concurrent.ExecutionException
) occurred with Genymotion but the solution there didn't help me, i.e.adb reverse tcp:8081 tcp:8081
. - I also tried changing Dev Settings/
Debug server host & port for device
to0.0.0.0:8081
instead ofMY_IP:8081
, whereMY_IP
is the IP of my PC.
I'm running react native 0.22.2
Solution
The problem was: key
was defined twice in a view somewhere, i.e. something like
<View key={index} key={other} ... />
So just remove one of the key
properties.
Intermediate step to find the solution:
At first, when pressing Start Chrome Debugging
in the React Native Menu, the app will run again, but the error will be shown in the console of the corresponding browser tab.
Then it shows a bit better error message.
Strangely this error doesn't occur on iOS.
Answered By - Andru
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