Tk-hiero-export bug

I tried to export a sequence with tk-hiero-export v0.7.0 in Hiero 13.0v1 but failed. I went deep into the source code of tk-hiero-export and found a bug.

In tk-hiero-export/ at master · shotgunsoftware/tk-hiero-export · GitHub, there is the following line of code

start, end = self.inputRange(

the function inputRange has not been defined anywhere. Everytime when tk-hiero-export executes to this line, Hiero freezes.