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Try to adding full path of your map file. You can see launch file [here].(https://github.com/turtlebot/turtlebot_apps/blob/indigo/turtlebot_navigation/launch/amcl_demo.launch)

roslaunch turtlebot_gazebo amcl_demo.launch map_file:=/home/zuo/my_maps/some_map.yaml

Try to adding full path of your map file. You can see launch file [here].(https://github.com/turtlebot/turtlebot_apps/blob/indigo/turtlebot_navigation/launch/amcl_demo.launch)here.

roslaunch turtlebot_gazebo amcl_demo.launch map_file:=/home/zuo/my_maps/some_map.yamlmap_file:=/home/zuo/my_maps/some_map.yaml


Try to adding full path of your map file. You can see launch file here.

roslaunch turtlebot_gazebo amcl_demo.launch map_file:=/home/zuo/my_maps/some_map.yaml


Also be sure the amcl_demo.launch exists in turtlebot_gazebo package. So, It may be:

roslaunch lturtlebot_navigation amcl_demo.launch map_file:=/home/zuo/my_maps/some_map.yaml


Try to adding full path of your map file. You can see launch file here.

roslaunch turtlebot_gazebo amcl_demo.launch map_file:=/home/zuo/my_maps/some_map.yaml


Also be sure the amcl_demo.launch exists in turtlebot_gazebo package. So, It may be:

roslaunch lturtlebot_navigation turtlebot_navigation amcl_demo.launch map_file:=/home/zuo/my_maps/some_map.yaml


Try to adding full path of your map file. You can see launch file here.

roslaunch turtlebot_gazebo amcl_demo.launch map_file:=/home/zuo/my_maps/some_map.yaml


Also be sure the amcl_demo.launch exists in turtlebot_gazebo package. So, It may be:

roslaunch turtlebot_navigation amcl_demo.launch map_file:=/home/zuo/my_maps/some_map.yaml


Try to adding full path of your map file. You can see launch file here.

roslaunch turtlebot_gazebo amcl_demo.launch map_file:=/home/zuo/my_maps/some_map.yaml


EDIT: Not a problem, I'm using Tanzanian English too :) You can follow link (the file is in above link) in my answer, and look map_file parameter. If it's searching package like this -->

"$(find some_package)/$(arg map_file)"


you can use your folder's path in your <workspace>/src/<PATH> directly. If you didn't edit default lanunch file (the file is in above link), It's using full path. You can also create your own launch file.

Try adding full path of your map file. You can see launch file here.

roslaunch turtlebot_gazebo amcl_demo.launch map_file:=/home/zuo/my_maps/some_map.yaml


EDIT: Not a problem, I'm using Tanzanian English too :) You can follow link (the file is in above link) in my answer, and look map_file parameter. If it's searching package like this -->

"$(find some_package)/$(arg map_file)"


you can use your folder's path in your <workspace>/src/<PATH> directly. If you didn't edit default lanunch file (the file is in above link), It's using full path. You path(or TURTLEBOT_MAP_FILE environment variable default.).You can also create your own launch file.

Try adding full path of your map file. You can see launch file here.

roslaunch turtlebot_gazebo amcl_demo.launch map_file:=/home/zuo/my_maps/some_map.yaml


EDIT: Not a problem, I'm using Tanzanian English too :) You can follow link (the file is in above link) in my answer, and look map_file parameter. If it's searching package like this --> this:

"$(find some_package)/$(arg map_file)"


you can use your folder's path in your <workspace>/src/<PATH> directly. If you didn't edit default lanunch file (the file is in above link), It's using full path(or TURTLEBOT_MAP_FILE environment variable default.).You can also create your own launch file.

Try adding full path of your map file. You can see launch file here.

roslaunch turtlebot_gazebo amcl_demo.launch map_file:=/home/zuo/my_maps/some_map.yaml


EDIT: Not a problem, I'm using Tanzanian English too :) You can follow link (the file is in above link) in my answer, and look map_file parameter. If it's searching package like this:

"$(find some_package)/$(arg map_file)"


you can use your folder's path in your <workspace>/src/<PATH> directly. If you didn't edit default lanunch file (the file is in above link), It's using full path(or full path in TURTLEBOT_MAP_FILE environment variable default.).You can also create your own launch file.