u/Hot-Raccoon9465

Hello everyone, I am trying to run the Manning's Roughness N calibration on 1D Unsteady Modelling in HECRAS. I have defined the observed gaging location cross sections & Flow Roughness Factor for all the cross sections. But when I am setting up the "Unsteady Roughness Calibration" once I check the calibration option there is no dropdown menu to select the calibration gage. Please help me solve this. Thank You!