- Check the closed issues, your question maybe is not new.
- We can't debug your physical devices.
- If the library is not working 99% you did something wrong, in the code or in the phone permissions.
Tell us which versions you are using:
- react-native-ble-manager v?.?.?
- react-native v?.?
- iOS/Android v.?
Tell us what should happen
Tell us what happens instead
Hint: it would help a lot if you enable the debugger ("Pause on exceptions" in the "Source" panel of Chrome dev tools) and spot the place where the error is thrown