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Could not connect development server:

when i'm trying to reload or Enable live reload , in my physical device can't be reloaded.
it's showing error like this

also i'll try the below instructions:

Make sure your laptop and your phone are on the same Wi-Fi network.
Open your React Native app on your device.
You'll see a red screen with an error. This is OK. The following steps will fix that.
Open the in-app Developer menu.
Go to Dev Settings → Debug server host & port for device.
Type in your machine's IP address and the port of the local dev server (e.g. 10.0.1.1:8081).
Go back to the Developer menu and select Reload JS.

but still getting same error, any idea about this?