Complex durations cant be converted to MusicXML

[cgl8]

Hi,

I am unfamiliar with the MusicXML file format, but I am attempting to generate fingerings from a .mid file on an Ubuntu system. Upon hitting GENERATE, I get the following:

...
meas.100 finger_2  plays  C#3   v=9.1    [2, 5, 3, 1, 3, 2, 4, 1, 3] d:9
Saving score to output.xml
music21.musicxml.xmlObjects.MusicXMLExportException: In part (Piano), measure (189): Cannot convert complex durations to MusicXML. Try exporting with makeNotation=True or manually running splitAtDurations()

I have tried going to the file and adding the two suggested lines, but neither seemed to work.