pybootchart crashes with module not found

[WarpspeedSCP]

Here is the output -

Traceback (most recent call last):
  File "/usr/bin/pybootchartgui", line 20, in <module>
    from pybootchartgui.main import main
ImportError: No module named pybootchartgui.main

the command I ran was pybootchartgui -i.