adb.exe: no devices/emulators found

This error message typically means that the computer running the adb command cannot find any connected Android devices or emulators. Here are some possible solutions to try:

1. Ensure that your Android device is properly connected to your computer via USB cable, and that USB debugging is enabled in your device's developer options.

2. If you are using an emulator, make sure it is currently running and that you have properly set it up in Android Studio or your preferred IDE.

3. Restart your computer and Android device, and try running the adb command again.

4. Try using a different USB cable or USB port on your computer to see if that resolves the issue.

5. Make sure that the appropriate drivers are installed on your computer for your Android device.

6. If you are using Windows, try opening the command prompt as an administrator and running the adb command again.