Using excel file to determine slider marker start value

I’ve created an experiment where participants move the slider to respond to a question and am trying to create a new routine to give corrective feedback using another slider. Is it possible for psychopy to read values from an excel file that provide the location coordinates for the slider marker? I tried doing this and entered the condition name from the excel file as the variable for ‘startValue’ in the builder but keep receiving a name error saying: NameError: name ‘Balance_Point_Location’ is not defined.