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error listen EADDRINUSE: address already in use :::8081.
Error: listen EADDRINUSE: address already in use :::8081
    at Server.setupListenHandle [as _listen2] (net.js:1320:16)
    at listenInCluster (net.js:1368:12)
    at Server.listen (net.js:1454:7)
    at C:\Users\Admin\AppTest\node_modules\metro\src\index.js:279:18
    at new Promise (<anonymous>)
    at Object.<anonymous> (C:\Users\Admin\AppTest\node_modules\metro\src\index.js:278:12)
    at Generator.next (<anonymous>)
    at asyncGeneratorStep (C:\Users\Admin\AppTest\node_modules\metro\src\index.js:68:24)
    at _next (C:\Users\Admin\AppTest\node_modules\metro\src\index.js:90:9)
info Run CLI with --verbose flag for more details.