Hi @Phoebe, thanks for your question and for uploading your logfile and soils raster. It really helps to have this info upfront so we can help debug issues!
It looks like your raster actually contains many 0 values—I’m assuming these are meant to represent nodata? Could you try reclassifying your raster so that the nodata pixels have some other value? You may want to read through this thread on a similar issue—in it, two users share how they solved the same problem, one using QGIS and another using ArcMap: Urban Flood Risk Mitigation - Soil Group Raster preparation error?