Display model name if no uvs when building tangents.

hxd/fmt/fbx/HMDOut.hx

@@ -38,7 +38,7 @@ class HMDOut extends BaseLibrary {
 		var index = geom.getIndexes();
 
 		if ( index.vidx.length > 0 && uvs[0] == null )
-			throw "Need UVs to build tangents";
+			throw "Need UVs to build tangents in " + geom.getRoot().getName();
 
 		#if (hl && !hl_disable_mikkt && (haxe_ver >= "4.0"))
 		var m = new hl.Format.Mikktspace();