Sorry for the inconvenience, i'll tell peppy about this as soon as he wakes up.
For the time being, if you want to create beatmaps, do it normally, and when that error pops up, close the game, go into the folder of the song you're making, and proceed to open the .osu file with notepad.
If there isn't a line called [TimingPoints] add it, and add this line below: 5000,434.782608695652
It should end up like this
[TimingPoints]
5000,434.782608695652
Make sure there aren't any more number lines between "timingpoints" and the next "section" (sections are noted by the [] symbols)