error when trying to convert midi

[Sighfour]

==== Start of Keppy's MIDI Converter Error ====
BASSException: BASS_ERROR_NOTAVAIL

BASSException: BASS Error: BASS_ERROR_NOTAVAIL

Calling method: BASSTempoAndFilter (Void BASSTempoAndFilter())
at KeppyMIDIConverter.BASSControl.BASSCheckError() in E:\GitHub\KMC\KeppyMIDIConverter\Functions\BASSControl.cs:line 132
at KeppyMIDIConverter.BASSControl.BASSTempoAndFilter() in E:\GitHub\KMC\KeppyMIDIConverter\Functions\BASSControl.cs:line 659
at KeppyMIDIConverter.BASSControl.BASSStreamSystemRT(String str, Boolean PreviewMode) in E:\GitHub\KMC\KeppyMIDIConverter\Functions\BASSControl.cs:line 622
==== End of Keppy's MIDI Converter Error ====

how do i fix this