Bear tool box and input excel

While I am using the Bear toolbox to run time varying parameter model. I am bit confused how can I make my excel sheet to be recognized by the bear app. I import my own excel sheet that I used to collect data and every time I click a run button it says something like exo mean priors not found or something similar to this. I assume there is an excel sheet format that I am supposed to use in bear toolbox but I cannot really find it anywhere. Can anyone help me out?

For your reference: https://www.ecb.europa.eu/press/research-publications/working-papers/html/BEAR_toolbox_v5_1.pdf --> the slide 22 talks about input excel data file but I am confused.