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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

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

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

"$(find some_package)/$(arg map_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.