From e56d9bc1380a7f02988401961753b4af0df066d6 Mon Sep 17 00:00:00 2001
From: Tanishq Chaudhary <tanishqchaudhary101010@gmail.com>
Date: Sat, 26 Feb 2022 16:27:28 +0530
Subject: [PATCH] Resolved the error of drone not spawning in world.

"Error [parser.cc:525] parse as sdf version 1.7 failed, should try to parse as old deprecated format
    Error Code 4 Msg: Required attribute[xmlns:xacro] in element[sdf] is not specified in SDF.
    Error Code 8 Msg: Unable to parse sdf element[sdf]"

The following error had been reolved.
---
 models/iris_with_ardupilot/model.sdf | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/models/iris_with_ardupilot/model.sdf b/models/iris_with_ardupilot/model.sdf
index 8d522c74..fb0a6afa 100755
--- a/models/iris_with_ardupilot/model.sdf
+++ b/models/iris_with_ardupilot/model.sdf
@@ -1,5 +1,5 @@
 <?xml version='1.0'?>
-<sdf version="1.6" xmlns:xacro='http://ros.org/wiki/xacro'>
+<sdf version="1.6">
   <model name="iris_demo">
     <include>
       <uri>model://iris_with_standoffs</uri>