open TELEMAC-MASCARET The mathematically superior suite of solvers

Good morning everyone!
I am a newbie (extremely newbie) using Mascaret and I am having some issues running my model in the unsteady mode. I did run the simulation in the steady flow and after changing the noyau to fluvial non permanent I got stuck with the initial conditions. It works quite differently with respect to hecras and it is giving me a hard time. I used the "reprise de dernier résultat" option for the ligne d'eau, and when trying to run the simulation, it gave me an error that says "Problème lors de la conversion en fichier de ligne d'eau initiale: conversion des parametres null". Any help would be appreciated!

Thanks!