Error adding port adding port Roland UM-ONE for output.
Error adding port adding port BandHelper for output.
Error adding port adding port BandHelper for input.
Please help
The BandHelper ports are virtual MIDI ports, which you would only need if you want to exchange messages with another app on the same device.
For the UM-ONE port, how are you connecting the UM-ONE; what kind of device are you running BandHelper on; and does that error appear always or just sometimes?