Could not convert string to float

[samNCDE]

Everytime that I try to run the tool, I get the same error "Could not convert string to float" I get this error when I enter shapefiles and DEMs as the inputs and I get the same error when trying to run the tool without any data input. I am also wondering why the traceback is linking back to "C:\Users\jordang\Desktop\VBET-2-master\VBET.py" line 46 in VBET