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For error

Error [Param.cc:181] Unable to set value [1,0471975511965976] for key[horizontal_fov]
Error [Param.cc:181] Unable to set value [0,100000001] for key[near]

Workaround: $ export LC_NUMERIC=C or you might want to add that line to your ~/.bashrc.

But the problem with "namespace not found", I had the same. Two days ago I installed ros indigo -> gazebo -> gazebo_ros plugin and kobuki_gazebo, everything ok. Now I reinstall them, with the bit different: first gazebo -> then ros indigo... and I encounter errors like you

Sorry for my bad English :P

For error

Error [Param.cc:181] Unable to set value [1,0471975511965976] for key[horizontal_fov]
Error [Param.cc:181] Unable to set value [0,100000001] for key[near]

Workaround: $ export LC_NUMERIC=C or you might want to add that line to your ~/.bashrc.

But the problem with "namespace not found", I had the same. Two days ago I installed ros indigo -> gazebo -> gazebo_ros plugin and kobuki_gazebo, everything ok. Now I reinstall them, with the bit different: first gazebo -> then ros indigo... and I encounter errors like you

Sorry for my bad English :P

UPDATE

Finally I got it! Gazebo try to collect models from http://gazebosim.org/models but there 's something wrong... the folder ~/.gazebo/models does not exist and Gazebo simulator can not start. Here's a bit more simple solution: run $ wget -r -R "index\.html*" http://old.gazebosim.org/models/

to get all models from gazebosim and copy them into ~/.gazebo/models folder (after you mkdir models inside ~/.gazebo) and everything will be ok.

For error

Error [Param.cc:181] Unable to set value [1,0471975511965976] for key[horizontal_fov]
Error [Param.cc:181] Unable to set value [0,100000001] for key[near]

Workaround: $ export LC_NUMERIC=C or you might want to add that line to your ~/.bashrc.

But the problem with "namespace not found", I had the same. Two days ago I installed ros indigo -> gazebo -> gazebo_ros plugin and kobuki_gazebo, everything ok. Now I reinstall them, with the bit different: first gazebo -> then ros indigo... and I encounter errors like you

Sorry for my bad English :P

UPDATE

Finally I got it! Gazebo try to collect models from http://gazebosim.org/models but there 's something wrong... the folder ~/.gazebo/models does not exist and Gazebo simulator can not start. Here's a bit more simple solution: run $ wget -r -R "index\.html*" http://old.gazebosim.org/models/

to get all models from gazebosim and copy them into ~/.gazebo/models folder (after you mkdir models inside ~/.gazebo) and everything will be ok.

UPDATE 2

See @Juni answer for better way to download models.