Examples of error codes are:
- Error! (0x0000)
- Error! (0x001E)
- Error! (0x0023)
Try this solution
Hard close the Melomania app and try again
Put both earbuds back in their case, close the case, then take them out and try again
Put both earphones back into the charging case to allow auto-power off and then remove both earphones to allow auto-power on. Your Melomania earphones will automatically connect to your device again.