write file correctly

src/main.rs

@@ -1542,6 +1542,11 @@ async fn compile(config:CompileConfig)->AResult<()>{
 		output_place.push("place.rbxl");
 	}
 	let output=std::io::BufWriter::new(std::fs::File::create(output_place)?);
-	rbx_binary::to_writer(output,&dom,&[dom.root_ref()])?;
+	//write workspace:GetChildren()[1]
+	let workspace_children=dom.root().children();
+	if workspace_children.len()!=1{
+		return Err(anyhow::Error::msg("there can only be one model"));
+	}
+	rbx_binary::to_writer(output, &dom, &[workspace_children[0]])?;
 	Ok(())
 }