gazebo打开ardupilot模型会报错

Question

gazebo打开apm_gazebo的世界会报错，我已经下载好了models，并且放置到了~/.gazebo/models/目录下。求大神指点一下～

Warning [parser.cc:759] XML Attribute[xmlns:xacro] in element[sdf] not defined in SDF, ignoring.
[Wrn] [ModelDatabase.cc:340] Getting models from[http://gazebosim.org/models/]. This may take a few seconds.
[Msg] Connected to gazebo master @ http://127.0.0.1:11345
[Msg] Publicized address: 192.168.10.140
[Err] [Node.cc:105] No namespace found
[Err] [Node.cc:105] No namespace found
[Err] [Node.cc:105] No namespace found
[Err] [Node.cc:105] No namespace found
[Err] [Node.cc:105] No namespace found
[Err] [Node.cc:105] No namespace found
[Err] [Node.cc:105] No namespace found
[Err] [Node.cc:105] No namespace found