Errors adding midi ports

[KeytarPaul]

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

[arlo]

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?