Unable to use custom .sfh files

[stefanthony]

For my research I plan to derive the best parameters used in chemevol to recreate observed quantities for a selection of galaxies.
I have gathered some data including the SFH, but chemevol wouldn't accept the file after converting the data to a .sfh file following the example.
After discussing it with my supervisor it seems that there are also problems when using MW.sfh.
Is there a way to use a custom .sfh file for the SFH?
The error that I get, is:
time = self.sfh[:,0] # this is in units of Gyrs
TypeError: 'NoneType' object is

[stefanthony]

Also, if I compare the Milkyway.sfh with the figures given in the Yin et al. (2009) paper, it seems that the Milkyway.sfh aligns more with the total infall rate in figure 6 than the total SFR. Is this correct?