the zone raster (your watersheds) must be an integer raster, and it must have an attribute table. If it wasn't automatically built, you can build one with the Build Raster Attribute Table. 区域栅格(您的分水岭)必须是整数栅格,并且它必须具有属性表。 如果未自动构建,则可以使用构建栅格属性表构建一个构建栅格属性表。