Could not connect to develpement server

hi ,
when i try to run the jitsi mobile app on my device with this command:
react-native run-android
it shows me this error :

so what’s whent wrong .Thanks

Did a terminal window open with the React Native bundler? Try running adb reverse tcp:8081 tcp:8081 and hitting reload.

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Yes .I try adb reverse tcp:8081 tcp:8081 and rerun but still the same problem could not connect to development server .